Protective device for hydraulic universal testing machine

The utility model discloses a hydraulic universal testing machine protection device which comprises a workbench, a control cabinet and a base, the upper end of the workbench is connected with a top plate through a vertical rod, protection plates are hinged to the four side edges of the top plate, air cylinder assemblies are hinged between the side faces of the protection plates and the top plate, and observation windows are arranged on the side faces of the protection plates. The protection plate comprises an upper plate and a lower plate, and the lower plate is movably clamped in the upper plate. According to the hydraulic universal testing machine protection device, the protection plate is driven by the air cylinder assembly to be lifted upwards or closed downwards, closing of the protection plate is automatically controlled, the automation degree of the device is improved, operators are protected through the protection plate, the whole experiment process can be observed through the observation window, the