Ang Ui-jin obtained his Bachelor's degree in Chinese Studies from Chinese Culture University in 1969 and his Master's degree from the Chinese Language Research Institute of National Taiwan Normal University in 1973.

He was persecuted during the White Terror and sentenced to life imprisonment for "crimes of rebellion" (預備叛亂罪) in 1973. Later, he was granted amnesty and released from prison after 6 years and 8 months.

He then obtained his Ph.D. from the Language Research Institute of National Tsing Hua University. His research expertises include Min Nan phonetics, dialectology, Chinese phonology, and the sociology of language.

He was once a full-time associate professor at Yuan Ze University. He became dean and full-time professor at the Department of Taiwanese Languages and Literature at National Taichung University in 2006.

He was the 6th President of the Taiwan Linguistics Society (台灣語文學會). In 1992 he founded Taiwanese Hokkien magazine Digest of the Taiwanese language (台語文摘).

Ang Ui-jin's oldest son is Mark Ang (洪馬克), the founder of the Formosa Festival of International Filmmaker Awards (FFIFA) and an award-winning director in Taiwan.

• 中國訓詁學之理論基礎 [The theoretical foundation of Chinese Exegesis]. National Taiwan Normal University. 1971.
• 台灣河佬話聲調研究 [Tone research on Taiwanese Hokkien]. Taipei: 自立晚報 Independence Evening Post. 1985.
• 台灣禮俗語典 [Dictionary of Taiwanese etiquette]. Taipei: 自立晚報 [Independence Evening Post]. 1986.
• 台灣方言之旅 [Insight into Taiwanese dialects]. Taipei: 前衛出版社 [Qianwei Publisher]. 1992.
• 台灣語言危機 [Linguistic danger of Taiwanese languages]. Taipei: 前衛出版社 [Qianwei Publisher]. 1992.
• 『彙音妙悟』與古代泉州音 [Phonology of Quanzhou speech]. Taipei: 國立中央圖書館台灣分館 [National Central Library Branch]. 1996.
• 台灣話音韻入門──附台灣十五音字母 [Introduction to Taiwanese phonology]. Taipei: 國立復興劇藝實驗學校 [National Art Revival School]. 1996.
• 台灣文獻書目解題：語言類 [Taiwanese explanation on titles of sources: linguistics]. Taipei: 國立中央圖書館台灣分館 [Taipei National Art Revival School]. 1996.
• 高雄縣閩南語方言 [Kaohsiung county's Minnan Dialect]. 高雄縣政府 [Kaohsiung County Government]. 1997.
• 新竹市志‧住民志‧語言篇 [Hsinchu city novel: dweller's stories: Language chapter]. 新竹市政府 [Hsinchu City Government]. 1997.

• Taiwanese Romanization System
• Pe̍h-ōe-jī
• Taiwanese Hokkien
• Hokkien
• Taiwanese Hangul

• Klöter, Henning (2005). Written Taiwanese. Wiesbaden: Harrassowitz. ISBN 3-447-05093-4.

• 洪惟仁：台語文工作者 [Ang Ui-jin's Website] (in Traditional Chinese). Archived from the original on 2023-04-09. Retrieved 2009-10-14.