The present invention discloses a mold base with a workpiece burr removal function and a workpiece burr removal method, and belongs to the technical field of auxiliary cutting of a cold forming mold base. The mold base includes a mold base system, a material pressing system, and a cutting system; the cutting system includes a power part, a rotation part, a floating material part, and a cutter; theworkpiece is mounted in the mold base system and compressed and fixed by the material pressing system; the power part drives the rotation part to rotate; the cutter and the rotation part synchronously rotate around the workpiece; and the workpiece is cut by the cutter to remove the burr. In the mold base of the present invention, the whole machining device is arranged in a small mold base, and the cutter is locked by using a self-locking structure; the workpiece uses a floating material structure to achieve material floating and ejection; and a floating structure and a positioning structure are added to the material pressing part. By using the mold base and the method, in-mold machining, row cutting, handling, and other actions are achieved, and a main body is prevented from being activein a machining process, thereby improving safety performance, accelerating the installation and disassembly speed, and reducing the manufacturing cost of a single workpiece; merged production with a plurality of forming stations may be carried out to achieve automatic handling.