Abstract: To improve the low hardness and poor adhesion of fluorocarbon coatings, and expand their further application in the marine antifouling field, hydroxyl hydrogenated rosin derivative was synthesized by reacting renewable resource hydrogenated rosin with epichlorohydrin. The structure of the derivative was characterized using acid value, hydroxyl value determination, as well as GC-MS and FT-IR techniques. The obtained product was used to modify fluorocarbon coatings, and the influence for the addition amount of hydroxyl hydrogenated rosin derivative on the performance of the modified fluorocarbon coatings was studied. The results showed that hydroxyl hydrogenated rosin derivative was a mixture of 3-hydrogenated rosin acyloxy-2-hydroxypropyl chloride and 3-hydrogenated rosin acyloxy-1, 2-dihydroxy-propane. The acid value of derivative was 4.7 mg/g, and the hydroxyl value was 243.1 mg/g. With the increase of hydroxyl hydrogenated rosin derivative amount, the drying time, the pencil hardness and the adhesion strength of the modified fluorocarbon coatings increased, and the flexibility and impact resistance met the standard requirements. The coatings also exhibit good acid and alkali resistance(no abnormalities was found after it was immersed in acid and alkali solutions for 10 days). When the addition of the hydroxyl hydrogenated rosin derivative was 15%, the comprehensive performance of the coating was optimal, with drying time of 5.8 minutes, pencil hardness of 4H, coating adhesion strength of 15.5 MPa, and qualified results for 2 mm shaft bending and 50 cm impact test.