He gained wide public attention in the 1990s for his portrayal of Ben Yu in the 1991 legal drama File of Justice, appearing in all five seasons.
Au-Yeung is also known for his lead roles in several of TVB's most successful television series franchises, including Armed Reaction, Witness to a Prosecution, and Forensic Heroes.
Au-Yeung graduated from TVB's Artiste Training Academy in 1982 and began appearing in many television dramas as background extras, to roles with minor speaking parts, and later to major supporting roles.
He landed his first lead role in the legal drama File of Justice, which premiered in 1992.
Au-Yeung won Best Actor at the 2000 TVB Anniversary Awards for his portrayal as Sung Chee in Witness to a Prosecution.