Performance testing device for gas diffusion layer of fuel cell

The invention relates to the technical field of fuel cell performance testing, and particularly discloses a fuel cell gas diffusion layer performance testing device which comprises a supporting frame, a gas inlet barrel, a gas exhaust barrel, a hydraulic cylinder and a sample to be tested, the hydraulic cylinder is located at the top end of the supporting frame, and the movable end of a piston rod of the hydraulic cylinder is fixedly connected with the top end of the gas exhaust barrel; a limiting structure is arranged between the air inlet cylinder and the exhaust cylinder, and an ejection structure is arranged between the air inlet cylinder and the exhaust cylinder. The device has a structure for testing the air permeability of gas diffusion layers with different thicknesses, has a structure for adjusting the assembly pressure of the gas diffusion layers, improves the accuracy of air permeability test data, and has a structure for detecting the air permeability of the gas diffusion layers under different hu