Disclosed is a method for controlling the pattern-width of a coating liquid dispensed from a nozzle. The method includes the steps of: dispensing the coating liquid downward from the nozzle in a dispensing position on a measurement reference line to photograph with a camera positioned at a predetermined horizontal distance from the measurement reference line arranged perpendicularly to a coating reference surface; calculating the pattern-width of the coating liquid on the coating reference surface from image data obtained by photographing the coating liquid dispensed from the nozzle in the dispensing position with the camera; comparing the calculated pattern-width of the coating liquid with a coating liquid reference pattern-width; and adjusting dispensing pressure by increasing or decreasing pressure of air supplied to a pressure container that provides the coating liquid to the nozzle when the calculated pattern-width of the coating liquid is outside the reference allowed error.