Abstract: The paper introduced design of a test device of comprehensive performance of electromagnetic pilot valve with small flow and its working principle. The device can realize test of the electromagnetic pilot valve separately. It uses energy accumulator as power source to conduct dynamic load test, so as to reduce energy consumption. It can realize tests of multiple electromagnetic pilot valves with different types at the same time through connecting valve plates, so as to improve working efficiency. And it can realize test of electrical and hydraulic indexes by using one test device, so as to reduce test steps.