Acupuncture needle with preheating function

The acupuncture needle with the preheating function relates to the technical field of acupuncture and comprises a cylinder, a rectangular groove is formed in the cylinder, a through groove is formed in the bottom face of the inner wall of the rectangular groove, a needle body is connected to the side face of the inner wall of the through groove in a sliding mode, and deflection strips are connected to the left side and the right side of the inner wall of the rectangular groove in a rotating mode. Grooves are formed in the opposite sides of the two deflection strips, heating blocks are rotationally connected to the side faces of the inner walls of the grooves, the side faces of the heating blocks make contact with the side face of the needle body, arc-shaped grooves are formed in the front side and the rear side of the left side and the right side of the inner wall of the rectangular groove, and sliding blocks are slidably connected to the side faces of the inner walls of the arc-shaped grooves. According to t