The invention provides a BMS circuit test system. The system comprises a plurality of LMU test devices, a BMU test device, an HVB test device, a protection module, a protection cover and a test control device, wherein the LMU test devices, the BMU test device, the HVB test device, the protection module and the test control device are arranged in the protection cover; the BMU test device, the HVB test device and various LMU test devices are connected with the test control device, and the protection module is connected with the test control device; each LMU test device is connected with a localbattery monitoring unit, the BMU test device is connected with the battery system management unit, and the HVB test device is connected with a high-voltage box. The test system provided by the invention has the advantages that the test efficiency and test coverage degree of the system can be improved.