Objective To figure out the effect of Ti particle size and content on the corrosion resistance of epoxy antistatic composite coatings. Methods In this paper, different addition amounts of PVP pre-treated Ti particles with different particle size were introduced into Bisphenol A(E) type epoxy resin, and the resultant composite coatings were prepared on Q235 sheets. Surface resistance test, section morphology observation, electrochemical polarization curves and impedance spectroscopy tests were conducted to investigate the antistatic properties, internal structure and corrosion resistance of the composite coating. Results The surface resistance of composite coatings with 28% Ti content (wt% in coating) decreased, and the section structure was more complex as the particle size increased from 40 nm to 200 nm. The coating with the maximum electrochemical resistance and minimum anodic current density was obtained when the Ti particle size was 100 nm. For composite coatings with 100 nm Ti particles, as Ti content increased from 7% to 28% , the coating surface resistance and electrochemical resistance decreased, while the coating section porosity and electrochemical anodic current density increased. Conclusion The addition of Ti nano-particles could effectively improve the antistatic property, densification and corrosion resistance of coatings. But when the Ti particle size was larger than 100 nm, the coatings with 28% Ti content had more complex section structure and decreased corrosion resistance. For composite coatings with 100 nm Ti particles, the densification and corrosion resistance decreased when the Ti content was more than 7% .