The invention discloses a processing process for a triangular cutting edge. The process comprises the following steps that 1, a line cutting machine is used for cutting a material into a triangular cone shape, the appearance of a product is cut according to the dimension in a drawing, the length is 27mm, the width is 27mm, and the height is 14mm; 2, a milling machine is used for carrying out positioning processing on the cut product, the hole drilling is carried out in the center of the square end surface of the material, and a round hole with the diameter being phi6.8+/-0.2mm is drilled; 3, a screw thread tapping machine is used for screw thread tapping, and the round hole with the diameter being phi6.8+/-0.2mm is subjected to M8 screw thread tapping; 4, the material crossing part is subjected to round corner forming, and R3 round corners are formed; 5, the material is subjected to stress processing; 6, a product after the processing completion is subjected to surface polishing, so that the surface roughness reaches Ra1.2; 7, the product is subjected to inspection and warehouse entering. The appearance is cut through the line cutting machine, the hole milling processing is carried out through the milling machine, the screw thread tapping machine is adopted for processing, and the round corner forming processing, the stress processing and the surface polishing are carried out for meeting the production requirements, and the precision and the intensity of the produced triangular cutting edge are improved, so that the requirements are met, the defective rate is reduced, and the production cost is reduced.