Fan used in tunnel

The fan used in the tunnel relates to the technical field of tunnel ventilation and comprises an air pipe body, a plurality of side pipes are fixed on the outer surface of the air pipe body at equal intervals in the circumferential direction, and a plurality of guide grooves penetrating into the side pipes are formed in the outer surface of the air pipe body at equal intervals in the circumferential direction. A plurality of guide grooves are formed in the inner wall of the air pipe body, guide strips with one ends extending into the side pipe are slidably connected to the interiors of the guide grooves, a plurality of drainage plates are rotatably connected between the inner walls of the air pipe body, and push rods are rotatably connected to the bottoms of the guide strips. According to the air duct, the push rod can be driven to push the drainage plate, so that the drainage plate is opened towards the center of the interior of the air duct body, air flow at the edge of the interior of the air duct body flo