The invention discloses a panel bending automatic production line. The panel bending automatic production line comprises a feeding lifting table, a belt conveying platform, a cold bending molding machine, a first transition feeding table, a hydraulic panel bending machine, a second transition feeding table, a stacking mechanical arm, an output line and a control system which are sequentially arranged, wherein the control system is electrically connected the above mechanisms. The feeding lifting table is composed of four hydraulic cylinders, the first transition feeding table and the second transition feeding table are each composed of a conveying belt and a sensing positioning device, the stacking mechanical arm is composed of a sucker and a rotary arm, and the hydraulic panel bending machine is composed of a rack, a bending device, a panel pressing device and a hydraulic driving unit. By means of the panel bending automatic production line, panels in variable specifications and different modes can be bent so as to form a full-automatic production line, and can be bent in the modes such as a U type, a C type, a U type with turning edges and a C type with turning edges, mechanical automatic feeding and discharging devices and the accurate stacking device are arranged on the production line, and the aims of bending the panels in variable specifications and different modes and forming the full-automatic production line are achieved.