He signed the death warrant for former Prime Minister Zulfikar Ali Bhutto in a controversial murder case.

He continued serving in the civil service after the independence of Pakistan as a result of partition of British India in 1947 and subsequently elevated as a judge in the Sindh High Court in 1957.

He was known for his judicial conservative philosophical leanings and is noted in country's political history for providing legality for the martial law upheld by chief of army staff General Zia-ul-Haq to restore law and order, in light of doctrine of necessity, as part of his conservative leanings.

[1][4] After the death sentence of Zulfiqar Ali Bhutto, who was convicted of murdering through proxy the father of one of his political opponents, Anwarul Haq took up the case against General Zia-ul-Haq's breaking his promise of holding elections.

During his time at the Punjab University, Anwarul Haq participated in a large number of declamation contests and prize debates and was often judged as the best speaker.

[12] He was appointed as joint secretary in MoD but later moved to Ministry of Law and Justice (MoLJ) to pursue career as federal judge.

[12] In 1965, he was appointed as the deputy leader of the Pakistan Delegation to the Third Commonwealth and Empire Law Conference held at Sydney, Australia in 1965.

[12] In 1970, he was elevated as Chief Justice of the Lahore High Court by President Yahya Khan who issued the decree, the LFO No.

: 141 [18] Anwarul Haq attended the Third Commonwealth and Empire Law Conference in Sydney, Australia in August–September 1965 as leader of the Pakistan delegation.

He was interested in academic and educational activities and had been a member of the Syndicates of: Anwarul Haq was President of the Himayat-i-Islam Law College, Lahore for several years.