The invention relates to a correction device for a three-air channel for a ship, which includes a bottom plate, a pressing and positioning device, a left fixing plate, a right fixing plate, a rear vertical plate and a corrector. The pressing and positioning device is installed in the middle of the upper end of the bottom plate, The left fixed plate, the right fixed plate, and the rear vertical plate are correspondingly fixed on the left, right, and rear parts of the base plate. The upper end of the rear vertical plate extends horizontally forward to form an extension. The number of the correctors is three One and three correctors are respectively installed horizontally in the middle of the left fixed plate, horizontally installed in the middle of the right fixed plate, and vertically installed in the middle of the extension. The invention has the advantages of reasonable structural design, high degree of automation and convenient operation, etc., and can realize the correction of three positions of the three-air channel at the same time, thereby ensuring the quality of the three-air channel and ensuring that the three-air channel meets the actual installation and use requirements.