Hard alloy expansion drill bit

The utility model provides a hard alloy expanding drill bit, and aims to solve the technical problems that the whole expanding drill bit in the prior art is time-consuming in storage and time-consuming and labor-consuming in installation in the using process. The expansion drill bit comprises a drill bit body, a through groove is formed in the drill bit body, the through groove is close to a cutter on the drill bit body, a connecting groove which is equal to the through groove in length and perpendicular to the through groove is formed in the drill bit body, and the length direction of the connecting groove is consistent with that of the through groove; one ends of the cutter handles are rotationally connected with the ends, close to the cutter, of the through grooves, the length of the cutter handles is smaller than that of the through grooves, the two cutter handles are arranged on the two sides of the through grooves respectively, and the sides, away from each other, of the two cutter handles are cutter ed