The preparation of high-adhesion photocurable metal anticorrosive coatingspresented a significant challenge. This study explored the use of upconversion particle-assisted near-infrared photopolymerization（NIR）to develop coatings with superior adhesionand corrosion resistance. The curing conditions of the NIR system，the curing behavior of the coatings，and the adhesion and corrosion resistance of coatings formulated with multifunctionalreactive diluents were investigated. The results indicated that the polymerization rate wasfastest and the double bond conversion was highest when the concentrations of photoinitiatorand upconversion particles（UCPs）were 2% and 4% respectively，and the NIR power densitywas 30 W/cm². Compared to UV curing systems，the NIR curing system achieved a doublebond conversion rate of 90% at both the top and bottom of the coating. Additionally，it increased the double bond conversion at the gel point，which could reduce curing shrinkage stress，thereby improving the adhesion and corrosion resistance of the coating. The coating withmonofunctional reactive diluent exhibited the highest adhesion，demonstrating excellent corrosion resistance. NIR curing provided a new strategy for the preparation of environmentallyfriendly，high-performance anticorrosive coatings，with promising potential for broader applications in the field of metal corrosion protection.