Vehicle rear axle cover body, vehicle rear axle assembly and vehicle

The utility model provides a vehicle rear axle cover body, a vehicle rear axle assembly and a vehicle, the vehicle rear axle cover body is used for blocking an opening in a vehicle rear axle shell, the vehicle rear axle cover body comprises a semi-ellipsoidal cover body, a containing groove with one open end is formed in the cover body, the containing groove is used for containing part of a main speed reducer, and in addition, the containing groove is used for containing part of the main speed reducer. The cover body is further provided with an oil injection hole and an energy absorption groove, the oil injection hole is communicated with the containing groove, and the energy absorption groove is located in the outer end face of the cover body. According to the vehicle rear axle cover body, the ground clearance can be reduced in the assembling state, and therefore the trafficability and cross-country ability of the whole vehicle can be improved; besides, the energy absorption grooves located in the outer end