The utility model discloses a circuit board flattening device which comprises a base, a plurality of moving rollers, a fixed box, two moving plates, an air bag, a moving rod, a spring, a guide plate, an
air blower and a three-way
pipe. Wherein the fixed box is fixedly installed on the base through the first supporting frame, and the fixed box is located on the side, close to the base, of the movable roller; the two moving plates are slidably mounted in the fixed box; the air bag is arranged in the fixed box and located between the two movable plates. The moving rod is arranged on the side, away from the
airbag, of the moving plate. The spring sleeves the moving rod; the guide plate is arranged at one end of the moving rod away from the moving plate; the
air blower is arranged on the fixed box and is communicated with the air bag; the three-way
pipe is communicated with the air bag and provided with a plurality of nozzles, and the nozzles are located on the side, away from the base, of the moving roller. Through the arrangement, the inclined circuit board can be corrected, and dust on the surface of the circuit board can be synchronously removed, so that the risk that the surface of the circuit board is scratched is reduced, and the possibility of damaging elements on the circuit board is also reduced.