Posters with cartoons of the Chief Minister were found in the area following which Trinamool Congress leader and Minister for Food & Supplies Jyotirpriya Mallick lodged a complaint with the Election Commission against unknown persons, they said.
Mallick alleged the two were SFI activists.
The duo surrendered at the Machlandapur Outpost, accepting that the poster campaign against Banerjee was their brainchild, police said.
"We have arrested them and are looking into the matter," a police official said.