The PEM electrolytic cell test system is designed to provide a stable test system for hydrogen production in PEM electrolytic cell. The system consists of circulating water system module, back pressure module, cooling and dehumidification module, nitrogen purge module, PLC acquisition and control module, man-machine operation and safety monitoring module. Used to check the polarization curve, single-cell consistency, hydrogen production energy consumption efficiency, hydrogen production quality test and product life test.