The invention aims to provide a wrench body used in a roller wrench. The wrench body includes a rotating plate, a cylindrical pin and a handle; the cylindrical pin penetrates through the rotating plate and makes the rotating plate and the handle movably connected; two vertically arranged connecting holes are formed in the rotating plate, the circle centers of the two connecting holes are coaxial, and the two connecting holes both penetrate through the rotating plate; the cylindrical pin is cylindrical and penetrates through the lower connecting hole to make the rotating plate and the handle movably connected; the diameter of the cylindrical pin is within 10-14 mm, and the length of the cylindrical pin is within 30-40; the handle is cylindrical, the radius of the handle is within 15-25 mm, the length of the handle is not less than 100 mm, and the end, connected with the cylindrical pin, of the handle is provided with a through hole. The wrench body used in the roller wrench has the advantages that the mechanical performance of the roller wrench is effectively improved, the size of each part is accurately calculated, unnecessary mechanical friction can be effectively reduced, and the service life of a workpiece is prolonged.