The invention belongs to the technical field of polymer powder processing and specifically relates to a preparation method for a polyether ketone ketone electrostatic spraying powder coating with a crosslinking property. The method comprises the following steps: after polymerization, mechanically crushing polyether ketone ketone; washing and drying, thereby acquiring rough polyether ketone ketone powder; stabilizing the rough powder and adding a modifying agent, thereby acquiring the modified rough powder; crushing the modified rough powder with air flow, thereby acquiring fine polyether ketone ketone powder; screening, thereby acquiring the polyether ketone ketone electrostatic spraying powder coating. According to the preparation method, the process is simple and convenient, the crushing efficiency is high and the impurity content is low; the prepared polyether ketone ketone electrostatic spraying powder coating is uniformly dispersed; the size distribution is concentrated; the particle morphology is near-spherical; a polyether ketone ketone coating is acquired in the manner of electrostatic spraying; after modification, the binding force of the polyether ketone ketone and the metal substrate can be obviously increased; the high temperature resistance and chemical resistance of the polyether ketone ketone electrostatic spraying powder coating can be correspondingly increased; the polyether ketone ketone electrostatic spraying powder coating can be widely used as the coating in the anticorrosion field.