The invention discloses a device for cooling a board overturning wheel, and relates to the technical field of wood processing. The device comprises a rotating shaft which is connected to a driving device, wherein a plurality of rows of board overturning rods are axially mounted on the rotating shaft; a board overturning bearing rack and a board conveying rack are correspondingly mounted at the twosides of the rotating shaft; a plurality of conveying rollers which are distributed at intervals are arranged on the board conveying rack; a cold air pipe is mounted between every two adjacent conveying rollers; air outlet holes are distributed in the cold air pipes; the cold air pipes are connected to air supplying devices. Compared with the prior art, the device has the advantages that cold airis blown to cool a rough board on the board conveying rack through the air outlet holes distributed in the cold air pipes, thus the rough board which is formed under high temperature and high pressure can be quickly cooled, and as a result, the following sanding process can be smoothly carried out.