The invention provides a ground brush rotation limiting structure comprising a shell provided with a dust suction air duct and a rotary joint installed on the shell and capable of rotating around a rotation shaft of the ground brush; the front edge of the bottom of the rotary joint is cooperatively arranged in a concave port in the shell; the concave port is of a V-shaped structure, and the V-shaped structure comprises a bottom end and a sliding rail extending to the two sides from the bottom end; and a limiting space for stopping the front edge of the bottom of the rotary joint is formed at the bottom end of the V-shaped structure so as to limit the rotary motion of the rotary joint in the two moving directions of the sliding rail. According to the ground brush rotation limiting structurein the invention, the V-shaped structure is arranged, the ground brush can be automatically reset under the assistance of a reset spring, and after being reset, the ground brush can be guaranteed tobe always in linear position with the machine body through the limiting structure. The ground brush rotation limiting structure in the invention is convenient to use, the labor cost is saved, the structure is compact, and the manufacturing cost is low.