Contact tube machining device capable of preventing drill bit from being overheated

The utility model relates to the technical field of machining devices, and discloses a contact tube machining device capable of avoiding overheating of a drill bit, which comprises a bottom plate, the upper end of the bottom plate is sequentially provided with a clamping mechanism, a U-shaped shell and a drilling mechanism from left to right, the upper end of the U-shaped shell is provided with a top groove, the upper end of the top groove is provided with a cross-flow fan, and the upper end of the cross-flow fan is provided with a drill bit. A magnetic suction ring is arranged at the output end of the left side of the exterior of the cross-flow fan, a dust collection net bag is arranged on the left side of the exterior of the magnetic suction ring, a water pump is installed on the right side of the upper end of the U-shaped shell, an atomization nozzle is arranged on the side, located in the U-shaped shell, of the output end of the water pump, and the atomization nozzle and the output end of the water pump a