A Hakka, Lee was elected vice-chairman of the Hong Kong University Students' Union in 1979. He graduated from the Faculty of Science of the University of Hong Kong with a pass. He first participated in politics in the 1980s and was the Vice-Chairman of the Association for Democracy and People's Livelihood (ADPL). He was elected to the District Council and the Regional Council in 1985 and 1986 respectively. He was a founding member of the Hong Kong Alliance in Support of Patriotic Democratic Movements of China.