The invention belongs to the technical field of material chemistry, and relates to a preparation method for a polyaniline-supported graphene coating. The method adopts an in-situ polymerization mannerto uniformly modify polyaniline on graphene oxide, KI is used to reduce graphite oxide, the product I2 is absorbed by polyaniline molecules, so that uniform modification of the polyaniline on the surface of reduced high-conductivity graphene is obtained, and the polyaniline has a synergistic role in increasing conductivity. According to the method disclosed by the invention, the coating obtainedby the method has high electrical conductivity and strong adhesion; the coating is prepared by adopting water-based slurry, so that the requirements of greenness and environmental protection are met;and the coating can be used in the fields such as static electricity resistance, electromagnetic shielding and conducting circuits.