The invention relates to the field of mechanical equipment, and particularly discloses a machine tool adjusting device. The machine tool adjusting device comprises a base, a bolt and an adjusting column, wherein a boss is arranged on the upper surface of the base; the adjusting column is in threaded connection with the boss and the base; a cover plate is fixedly connected to the top end of the adjusting column, and comprises a connecting plate and rotating plates; the connecting plate is fixedly connected with the top end of the adjusting column; the rotating plates are fixedly connected withthe connecting plate; and an adjusting hole is formed in each rotating plate. The machine tool adjusting device disclosed by the invention is used for horizontally adjusting a machine tool, and when the machine tool is horizontally adjusted, labor is saved.