Ng Suee Lim got involved in politics especially DAP after reading a lot of media statements and books by the then-DAP Secretary-General Lim Kit Siang since he was in Year 6 at 1981–1982. He always attends dinners organized by local political leaders to collect donations. In class, he always debated with the History teacher about some historical events until he was labeled as an opposition. In 1995, he became the head of DAP Kapar branch.
In 1999 general election, he was suggested by Ronnie Liu Tian Khiew and Teng Chang Khim to contest in the Sekinchan state seat because there were no more political veterans who wanted to contest there. He contested at the age of 29 and gained 3,728 votes and lost with majority of 2,044 votes but won in the Malay community because he could speak Javanese.
In 2004 general election, many voters returned to support BN and numerous DAP, PKR and PAS candidates lost. Shockingly, Ng Suee Lim won in Sekinchan with a majority of 344 votes. He became one of only two members of the opposition party in the Selangor State Legislative Assembly at that time, alongside Teng Chang Khim.
In the 2008 general election, he successfully defended the seat and gained 5,403 votes with a majority of 190 votes.
Ng Suee Lim successfully retained the Sekinchan state seat in the subsequent 2013, 2018 and 2023 state elections. On 26 June 2018, Ng Suee Lim was nominated as the new Speaker by Menteri Besar Amirudin Shari, Teng Chang Khim seconded the motion, and it was approved. Ng Suee Lim was sworn in at 10:07 in the morning.[3]
In 2023, he was appointed as a Selangor EXCO member in charge of Local Government, New Village Development and Tourism.[4][5]
