The invention discloses a method for predicting the thickness of a uniform piezoelectric electrode scale layer of a converter valve based on an electrode reaction. In order to solve the electrochemical corrosion and overheating problems caused by the fouling of homogeneous piezoelectric electrodes in the current water cooling system of converter valves, the technical scheme adopted by the invention is as follows: according to the internal cooling system structure of the valve section of the converter valve which is cooled by the parallel water circuit adopted by the converter station, the physical model structure of the water channel electrode reaction of the valve section is determined, and according to the operation condition, the calculation model of the water channel electrode reactionof the valve section is further established; the initial values and boundary conditions of electrode potential and deionized water potential are set by using the geometrical parameters of water channel, water quality parameters of deionized water and the working voltage value of converter valve when it is running. The electrode reaction model is constructed. The electrode fouling thickness is calculated. The present invention is advantageous to further acquiring the fouling data of the homogeneous piezoelectric electrode in the operation process of the converter valve, grasping the electrodefouling rule, timely replacing the homogeneous piezoelectric electrode of the converter valve, and providing powerful theoretical and technical support for guaranteeing the safe and stable operation of the converter station.