The invention discloses a copper foil surface chromic anhydride passivating treatment process. The copper foil surface chromic anhydride passivating treatment process comprises the steps of copper foil treatment, degreasing treatment, physical roughening, chemical roughening, curing treatment, obstruction layer arranging, passivation treatment and drying treatment. According to the process, 2000#abrasive paper is used for grinding, ground copper foil is put into a CuSO4 solution contained in a roughening groove to be subjected to chemical roughening, the physical roughening and the chemical roughening are combined, the roughening effect is greatly improved, the better roughening effect is achieved, after curing, alloy liquid is mixed liquid formed through mixing of alloy oxide and phosphoric acid and is adopted for making an obstruction layer, the isolation effect is improved, the oxidation resistance capacity is improved, when passivating treatment is carried out, a passivation powerbinding post is moved backwards from a previous conductive roller, the passivating effect is improved, in the roughening, curing and passivating process, the drug supplementing manner is changed into24-h supplementing of a metering pump from one-time adding, the drug supplementing manner is changed, and the treatment effect is better improved.