Ng founded a theatre group in Guangzhou in 1931 with Lo Duen and Lee Sun Fung. He came to Hong Kong in 1941 and starting acting in films, taking on roles of harmless, ordinary citizens of no big ambitions. In 1947 Ng directed 'Reunion at Full Moon'. By 1979 he had already acted in over 100 films and directed over 200 films, the better known of which are 'The Prodigal Son', 'Family', 'Father and Son', 'Rear Window', 'Wilderness' and 'Thunderstorm'. He was also one of the co-founders of Union Film Enterprise Ltd. In 1970 Ng joined RTV as a producer cum actor. He was best remembered by his performances in TV dramas 'Chameleon' and 'Fatherland'.