The invention provides a device for a power battery module side plate tensile test. The device comprises a base and a compression assembly. The base is fixed to a test table and provided with a threaded hole. The compression assembly comprises a vertically-arranged screw rod and a pressing plate horizontally installed at the lower end of the screw rod. The upper end of the screw rod penetrates out of the threaded hole, and the screw rod is in threaded connection with the threaded hole. The pressing plate is located between the base and the test table. The pressing plate can rotate along with the screw rod in the threaded hole so as to move up and down. The device is fixed to the test table and can accurately fix and press a power battery module, and accuracy of the tensile test can be greatly improved.