The invention discloses a method for adjusting a hot-pressing apparatus. The hot-pressing apparatus comprises a load conveyer and a supporting body, which support a glass substrate. The adjusting method comprises the steps of: filling a prescale film among the glass substrate, a pressure head and a buffering film in the operating state; pressing down the pressure head, then lifting the pressure head; and adjusting the height of the supporting body according to the color display difference of the prescale film at the load conveyer side and the supporting body side until the color is uniformly displayed. Because the prescale film senses pressure, the relatively horizontal position of the load conveyer and the supporting body can be adjusted very exactly. Through the technical adjustment, the cracked and broken screens caused by the nonuniform pressure because the glass substrate is not horizontally placed well are fundamentally eradicated.