Embodiments of the present application provide a control method of a leveling device, the leveling device comprising a
leveler, a spraying device and a blowing device, the
leveler comprising a rack and a roller, the method comprising: when a roll changing preparation
signal for the leveling device is triggered, reducing a
nozzle pressure of the spraying device; when a roll changing
signal for the
leveler is acquired, switching the leveler from an automatic working state to a
closed state; when a roll changing completion
signal for the leveler is triggered, keeping the blowing device in an open state for a first time length; when a roll changing completion signal for the leveling device is acquired, keeping the blowing device in the open state for a second time length, and restoring the
nozzle pressure of the spraying device after the second time length. The technical solution of the present application can realize control of the leveling device according to different signals, reduce the generation of surface indentation of the strip during production, and improve the quality of the strip.