The invention provides a forging hammer for bearing force piece machining. The forging hammer solves the technical problems that in the prior art, in the hammer rod using process, leftward and rightward deviation occurs, and waste cannot be collected. According to the forging hammer for bearing force piece machining, the cross section of a forging hammer body is of a polygon structure, a forging hammer guiding structure is arranged between the circumferential outer side of the forging hammer body and a frame, a cutting board body is arranged on a base, and the base is provided with a transparent cover. The diameters of the transparent cover are gradually increased from the upper end to the lower end. A forging window is formed in the upper end of the transparent cover. At least one side operation window is formed in the circumferential outer side of the transparent cover. The transparent cover is of a split structure and is formed by splicing a plurality of arc-shaped blocks. Detachable structures for positioning the arc-shaped blocks are arranged between the arc-shaped blocks. The forging hammer has the advantages that the forging hammer can be prevented from deviating leftwards and rightwards in the using process, the friction force is small, and the service life is long; and the waste collecting effect is good, and noise generated during forging can be isolated.