DMAEMA-MA as a new ionic liquid with unsaturated covalent bonds for both anion and cation was synthesized. Poly(2-acrylamide-2-methylpropane sulfonic acid-co-acrylamide) (IC-P(AMPS-co-AAM)) was prepared by polymerization of acrylamide (AAm) and 2-acrylamide-2-methylpropane sulfonic acid (AMPS) using DMAEMA-MA as the crosslinker. BIS-P(AMPS-co-AAm) was prepared by using N,N'-methylene bisacrylamide (BIS) as a non-ionic crosslinker, and the performance of BIS-P(AMPS-co-AAM) and IC (AMPS-co-AAM) was compared. Similar pore structure was observed by SEM. When the addition of DMAEMA-MA was 1.6%, the swelling rate in water could reach 235.97% and the conductivity reached 58.8 μS/cm. TGA shows that DMAEMA-MA can improve the thermal stability of IC-P(AMPS-co-AAM). The derusting performance of IC-P(AMPS-co-AAM) with different DMAEMA-MA content and BIS-P(AMPS-co-AAM) was investigated. The results showed that the derusting effect of Q235 low carbon steel with rust grade C could reach Grade A when DMAEMA-MA content was 1.6 wt%.