Anti-falling three-blade milling cutter

The utility model provides an anti-falling three-edge milling cutter. The anti-falling three-edge milling cutter comprises a cutter handle part, a three-edge milling cutter head and a fastening bolt, the cutter handle part comprises a cutter handle with an assembly hole and first threaded holes formed in the side parts of the two opposite ends, provided with the assembly hole, of the cutter handle, and the first threaded holes are communicated with the assembly hole; the three-edge milling cutter head comprises a connecting part inserted into the assembly hole, a second threaded hole formed in the connecting part and corresponding to the first threaded hole, and an edging end fixed to the side, away from the assembly hole, of the connecting part and integrally formed with the connecting part; the end, provided with threads, of the fastening bolt is in threaded connection with the first threaded hole and the second threaded hole, and the fastening bolt is used for connecting and fixing the cutter handle part a