The invention discloses a passivation formula of zincification trivalent chromium, which is characterized in that: the formula comprises the following components in parts by weight: 35-15 of Cr (NO3), 3-5 of cobalt nitrate, 1-3 of phosphate, 1.5-5 of nitric acid, 2-10 of boric acid, 1-10 of citric acid, 2-8 of malonic and 1-5 of malic acid. By adopting trivalent chromium for passivation, the invention is more environmental-friendly, after the applicant does experiments, the parameters such as passivation temperature, pH, time and the like can be controlled well by the formula of the invention, and good trivalent chromium passivation film with stable property and corrosion resisting can be obtained, which completely meets ROHS standards. In electroplating products, white rust resistance neutral salt spray test is for 72 hours, and red rust resistance neutral salt spray test is more than 240 hours.