The invention provides a device for a tensile test of a power battery module side plate. The device is used for fixing an L-shaped power battery module side plate and comprises a base and a pressing block, wherein the base is detachably fixed on a test bed, a strip groove is formed in the bottom of the base and at least penetrates through one end surface of the base, and a horizontal segment of the L-shaped power battery module side plate is inserted into the strip groove; and the pressing block is located in the strip groove, can move along the extension direction of the strip groove and can press the horizontal segment of the L-shaped power battery module side plate. The device is fixed on the test bed and can be utilized for accurately fixing and pressing a power battery module, so that the accuracy of the tensile test can be greatly increased.