Provided is an upper swing arm assembly for a heavy-type cross-country vehicle. The technical scheme is that the upper swing arm assembly for the heavy-type cross-country vehicle comprises an upper swing arm, a pin hole is formed in the connection portion of the upper swing arm and a vehicle frame, a spherical pin assembly is pressed in the pin hole in an interference mode, and two ends of the pin hole are fixedly connected with the spherical pin assembly through a locating piece, an inner sealing ring and an outer sealing ring. The upper swing arm assembly for the heavy-type cross-country vehicle is simple in structure, high in reliability, light in weight and low in cost.