Wool shearing device and tool bit assembly thereof

The utility model relates to a hair cutter and a cutter head assembly thereof, and belongs to the field of pet supplies. The shearing device comprises a main body and a tool bit assembly, a motor is arranged in the main body, and an eccentric shaft of the motor extends out of the front end of the main body; the tool bit assembly comprises a heat dissipation device, a static blade and a movable blade assembly. The heat dissipation device comprises a heat dissipation plate and a mounting structure, and a vertically-through containing cavity is formed in the front side of the mounting structure. The static blade is fixed on a bottom plate of the mounting structure; the moving blade assembly comprises a torsion spring, a moving blade holder and a moving blade, the moving blade is fixed on the moving blade holder, a connecting structure is arranged at the rear end of the moving blade holder, the moving blade assembly is arranged in the containing cavity, and the moving blade is in contact with the static blade; on