He is the incumbent Member of the National Assembly for Suwon 4th constituency since 2014, as well as the former secretary-general of the ruling liberal Democratic Party from 2020 to 2021.

[1] Prior to the 2012 election, he contested DUP preselection for Haenam-Wando-Jindo constituency,[2][3] but lost to the incumbent Kim Yung-rok.

[1][2][3] He was selected as the NPAD candidate for Suwon 4th constituency at the 2014 by-election,[2][5] after Kim Jin-pyo resigned in order to run as the governor of Gyeonggi.

[7][8] He defeated Lim Tae-hui of the then ruling Saenuri Party and subsequently became the NPAD's sole winner in Seoul Capital Area.

[15] Park Kwang-on was elected as the floor leader of the Democratic Party with the support of a majority of lawmakers in the first round of voting.