Locomotive coupler test device

The invention provides a locomotive coupler test device. The locomotive coupler test device comprises a bottom plate, a cover plate, a vertical plate assembly and a supporting assembly. The bottom plate is parallel to the cover plate and provided with an opening. The cover plate is U-shaped, and the opening direction of the cover plate is the same as that of the bottom plate. The vertical plate assembly is arranged on the bottom plate and supports the cover plate and comprises a rear vertical plate and two side vertical plate components, the two side vertical plate components are oppositely arranged and connected to the two ends of the rear vertical plate, a space is defined by the rear vertical plate, the side vertical plate components and the bottom plate and forms a space opening at the opening of the cover plate, the space comprises three parts, the first part is close to the rear vertical plate, and the second part is close to the cover plate. The third part is close to the space opening, and the second