The invention relates to a method for bending a glass plate and a device for bending a glass plate by using the method. The method comprises the following steps of: heating and softening the glass plate, transporting the glass plate into a forming region, lifting a supporting die, pre-bending the glass plate, lifting the glass plate by an upper pressing concave die, finally bending the glass plate, and transporting the glass plate into a cooling region or a tempering region for treatment. The device comprises a heating furnace, a transverse transportation roller bed, an upper pressing convex die, a lower pressing concave die and the supporting die. By using the method and the device provided by the invention, the heated and softened glass plate is quickly disengaged from the transverse transportation roller bed through the supporting die, the contact time between the glass plate and the transverse transportation roller bed is reduced, and the possibility of producing a roller trace onthe glass plate is eliminated. Through the method and the device, the machining process and equipment are simplified, the production cost is saved, and the production efficiency of the product is also improved.