Ground brush of dust collector

A ground brush of a dust collector comprises a shell and a connecting tube, wherein the shell is formed by the splicing of an upper cover and a bottom plate, the connecting tube is arranged at the rear part of the shell in a rotating manner, the rear part of the shell is connected with a sleeve which is capable of rotating around a first shaft axis, at least part of the inner wall surface of the sleeve is a sphere, a ball connecting head is arranged at the front end part of the connecting tube and can arranged in the sleeve in a rotating manner, the first shaft axis extends along the forward direction and the backward direction of the ground brush, convex shafts protruding outwards are respectively arranged on the left side and the right side of the ball connecting head, shaft seats are respectively arranged on the left inner wall surface and the right inner wall surface of the sleeve, the convex shafts are arranged on the shaft seats in a rotating manner, the center of the ball on which the sphere is arrange