Aiming at the lack of current existing hydraulic cylinder test device, the hydraulic control system of hydraulic cylinders testbed was designed. With multithreaded and multimodular programming by C# language, an automatic control system based on embedded operating system Windows CE was developed, and all types of test items required by the standard of hydraulic cylinders were achieved, and the loading framework program was given in which the space could be adjusted conveniently. Industrial test results show that the testbed is reliable with stable characteristic.