The electrical control system for hydrostatic pressure test bench based on WinCC and PLC was designed in view of the disadvantages of the system shutdown, cumbersome operation and low automation level during hydrostatic pressure test.In this system, SIMATIC S7-300 CPU was used as the core controller, S7-300 A station host and B station stand by structure was adopted, and the faulttolerant control was allowed to achieve S7-300 soft redundancy and increase the availability of the system. Sampling pressure signals of the two sensors were checked with each other to ensure the accuracy of measurement. The switch of sealing device, lifting of roller table, forward and backward of transport device, water injection and drainage control were integrated into the monitoring platform to achieve centralized control.The upper computer WinCC software was used to set the test steps, pressure and holding time parameters, and the lower computer PLC software was used to control the pressure test pump and solenoid valve to realize the automatic pressure and decompression of the system.The system has the advantages of strong availability, centralized control and high level of automation.