Objective The preparation of oil shrinkage cavity-resisting cathodic electrodeposition coating was introduced. Methods A blocked polyisocyanate with low deblocking temperature was prepared. It was quantitatively added as crosslinking agent for cathodic electrodeposition coatings. Then the oil shrinkage cavity-resisting performance, corrosion performance, and the appearance of coating film were investigated. Results The results showed that the suitable addition amount was 1 . 0 % ~ 1 . 5 % of the total cationic resin weight . The coating film had good appearance. The oil shrinkage cavity-resisting performance was excellent, and even no oil shrinkage cavity appeared when the addition amount was 1 . 5 % . The salt spray resistance reached up to 1032 h and the sharp edge corrosion resistance achieved up to level 1 . Conclusion Adding the appropriate low-temperature crosslinking agent can significantly improve the oil shrinkage cavity-resisting performance of electrophoretic paint film.