 Malouin was first elected to the House of Commons in an 1877 by-election held after Joseph Édouard Cauchon was named Lieutenant-Governor of Manitoba.He was elected again in 1878 but was defeated by Joseph-Guillaume Bossé when he ran for reelection in 1882.Malouin was a member of the council of the Quebec bar and served as bâtonnier in 1869 and 1877.