Fine-adjustable three-edge disc milling cutter

The utility model relates to a fine-adjustable three-edge disc milling cutter which comprises a cutter head, a plurality of cutter holder mounting grooves are uniformly distributed on the circumferential surface of the cutter head, cutter holders are arranged in the cutter holder mounting grooves, and fine-adjusting structures capable of adjusting the axial distances of the cutter holders are arranged at the joints of the cutter holders and the cutter holder mounting grooves. Blade mounting grooves are formed in the upper end faces of the tool aprons, the two blade mounting grooves in the adjacent tool aprons are formed in the left edge and the right edge of the upper end faces of the corresponding tool aprons respectively, chip containing grooves are formed in the left sides of the tool apron mounting grooves, and pressing blocks for pressing the tool aprons are arranged in the chip containing grooves. The tool apron is simple in structure and reasonable in design, the axial distance of the tool apron is adj