When loaders and other motor vehicles park on the slope, the component force of gravity along the slope is greater than the ground friction force, which leads to vehicle sliding along the slope, and even serious safety accidents occur due to slope sliding. The parking wedge is used to prevent the unnecessary movement of the vehicle. When using, the parking wedge is placed between the slope and the tire to stop the sliding of the tire. The existing portable parking wedge is a folding parking wedge, which includes a bottom plate, an upper support plate and a support plate. One end of the bottom plate is hinged with one end of the upper support plate through a pin shaft, and the upper end of the support plate is hinged with the upper support plate through another pin shaft, and the lower end is against the flat upper plate surface of the bottom plate. The parking wedge of this structure is fixed by the pin shaft at the fitting position of each plate to form a structural shape around the shaft When the whole vehicle stop at the inclined angle, the support plate of parking wedge often fails to support the upper support plate firmly, which leads to the vehicle flattening the parking wedge, thus losing the function of stopping the tire sliding.