Aminul's positional sense and ability to read the game made him one of the greatest goalkeepers in South Asian football history.

[1] Aminul is a product of MSPCC City Club and began his career in the Dhaka Premier Division League with Mohammedan SC in 1994.

His performances at the international level also attracted interest from clubs such as Newcastle United and Al Hilal SFC, although none of the moves were able to finalize.

While playing for the junior team of City Club in a local tournament in Alubdi village, Mirpur, Aminul received Tk 150 for his performances.

In 1995, after making a good impression on Mohammedan's Nigerian coach Kadiri Ikhana, Aminul was called up to the national camp for training.

[2] After his two-year binding at Mohammedan ended, Aminul joined Farashganj SC in the 1996 Premier Division League, for a salary of Tk 1.7 lakh.

[2] In 1997, Aminul joined Muktijoddha Sangsad KC where he became both Premier Division League and Mohonagari Cup champions in his lone season.

Under coach Pakir Ali, Aminul displayed some the best performances of his career and guided Abahani to the Federation Cup title in his debut season.

In 2001, he suffered a spinal disc injury that almost ended his career, until the national team head coach at the time, György Kottán, arranged Aminul's operation in Mumbai.

[6] In 2004, Aminul spent the Dhaka Premier Division League season successfully fighting for his position as the first-choice keeper with the club's junior goalkeeper, Titumir Chowdhury.

[13][14][15] In September 2010, Aminul was among the seventeen national team players to join Sheikh Jamal Dhanmondi Club for the 2010–11 Bangladesh League.

[23] After performing well with Abahani Limited Dhaka, national team coach Samir Shaker made Aminul the first-choice keeper for the 1999 SAFF Gold Cup in Goa, India, where Bangladesh finished runners-up.

Nonetheless, after breaking his fingers during the Bangabandhu Cup against Malaysia U23 on 31 August 1999, Aminul was left out of the team for the 1999 South Asian Games, during which Bangladesh won their first gold medal.

[2] In July 2000, Aminul toured England with the national team, and also featured in a 0–1 defeat to India during an friendly match held in London.

His inclusion was initially uncertain, as he had missed most of the previous domestic season due to an injury and had recently undergone spinal surgery in Mumbai.

[27] Following impressive performances with the national team, Aminul was contacted by English Premier League club Newcastle United for trials.

He missed the entirety of 2007 due to an injury but returned to the national side for the 2008 AFC Challenge Cup qualifiers held in Bishkek, Kyrgyzstan, during which the team was captained by Hassan Al-Mamun.

[34] In April 2009, Aminul was once again made captain under newly appointed head coach Dido, for the 2010 AFC Challenge Cup qualifiers.

[36] Following Dido's controversial departure prior to the 2009 SAFF Championship, Aminul led the team to a semi-final finish under interim coach Shahidur Rahman Shantoo.

[40] The tournament ended up being his last with the national team, and in his final senior international game against Sri Lanka on 20 February 2010, Aminul was sent off in a 0–3 defeat as Bangladesh crashed out of the group stage.

[23] He was loyal to his decision even after the Bangladesh Football Federation requested his presence in the team for the 2014 FIFA World Cup qualification – AFC first round, in June 2011.

At around 4pm I decided that I would make my escape and so I jumped from the first floor and ran straight to Hassan Al-Mamun's house at Balur Ghat in Cantonment area.

In the early hours of 12 September, police carried out an unprecedented raid on Abahani club in Dhanmondi in search of Aminul but couldn't find him.

While a frantic search for him was going on, Aminul popped up at Muktijoddha's central command office in the afternoon, claiming to have been taken to Abahani club at gunpoint and later held captive in a house in Mohammadpur.

[48] Aminul Haque has joined as Dhaka North City unit Member Secretary of the Bangladesh Nationalist Party for some time and during the 2009–2024 regime of the former Prime Minister Sheikh Hasina, he was arrested on November 1, 2023, on the grounds of two separate incidents of sabotage.