The work aims to study the protective properties of mercapto-organosilica sol-gel coating on copper alloy H90. Mercapto sol of mercaptopropyltrimethoxysilane (MAPMS) and ethylorthosilicate (TEOS) in different proportions were used as precursors and acetic acid was taken as catalyst to prepare the mercapto of functionalized organosilicone sol-gel. The as-prepared organosilicone sol-gel was coated on copper alloy H90 by dip coating and dried at 120 ℃. The electrochemistry, salt spray, contact angle, etc., were used to study the corrosion resistance, hydrophobicityand, pencil hardness of mercapto functional sol-gel coating. When the molar ratio of MAPMS:TEOS reached 1.5:1, the coating obtained the best corrosion resistance and the self-corrosion current density was 1.16×10?8 A/cm2, the pencil hardness of coating was 5H and the adhesion grade reached level 0. In neutral salt spray test, the test group with the molar ratio of 1:1 had a few spots on the 8th day, but the corrosion did not expand in the next 30 days. The other test groups did not have obvious corrosion during 30-day test. The mercapto-organosilicone sol-gel coating has good hardness and adhesion and can significantly improve the corrosion resistance of copper alloy H90.