Thread milling cutter with stable structure

The utility model relates to the field of milling cutters, in particular to a thread milling cutter with a stable structure, which comprises a supporting assembly, a cutter body and a reinforcing assembly, the supporting assembly comprises a base, a plurality of pre-tightening rods and a thread bushing, and the reinforcing assembly comprises a connecting ring, a plurality of sliding columns, a plurality of supporting springs and a control ring. During use, the control ring is inserted into the connecting ring to lift the sliding rod, then the cutter body is placed among the multiple pre-tightening rods, the threaded sleeve is rotated to be close to the connecting ring, and therefore the cutter body can be fixed, at the moment, the control ring slides to be away from the sliding column, the supporting spring can push the sliding column to be attached to the threaded sleeve, and the threaded sleeve is stabilized through friction force; in the working process, contact between the sliding rod and the threaded sle