CNC machining tool with circulating heat dissipation and temperature control functions

The utility model discloses a CNC (Computer Numerical Control) machining cutter capable of circularly dissipating heat and controlling temperature. The cutter comprises a circulating radiator, a cutter body and a lower limiting piece, the lower limiting piece is connected to the lower end of the cutter handle; a central hole of an inner liquid pipe of the circulating radiator is connected with the knife handle in an equal-diameter small-gap penetrating and sleeving manner; first convex ring bodies are arranged at the upper end and the lower end of the outer wall of the inner liquid pipe correspondingly, a circular-ring-shaped heat dissipation cavity is formed between the two first convex ring bodies, an anti-overflow ring groove is formed between the first convex ring bodies and the second convex ring bodies, an anti-overflow sealing body is placed in the anti-overflow ring groove, the outer sealing shell is connected to the outer walls of the first convex ring bodies, and the inner hole wall of the outer sea