Gun body and laser welding gun

The invention discloses a gun body and a laser welding gun, and relates to the technical field of laser welding. A laser channel through which laser can pass is arranged in the gun body, and the laser channel comprises a first channel and a second channel communicated with the first channel; the gun body comprises a gun head, a gun body and a shunting element, the first channel is arranged in the gun body, the second channel is arranged in the gun head, the gun head is connected with the gun body, and a plurality of heat dissipation chambers are arranged on the gun head; the shunting element is accommodated in the first channel, and a first hole penetrating through the shunting element along the extension direction of the first channel is formed in the shunting element and is used for allowing laser to penetrate through; the flow dividing element is further provided with a plurality of flow guiding gas paths, the flow guiding gas paths communicate with the heat dissipation chambers one by one, cooling gas ent