Vertical hydraulic pressure cold bending machine

A perpendicular hydraulic cold bending machine is applied in heavy caliber long conveying transportation pipeline construction building projects, which is characterized in that an upper die is fixed on the upper portion between a right lateral board and a left lateral board. An assist oil tank is fixed on one end of a lower die, and the upper end of the assist oil tank is fixed on the upper portions of the right and the left lateral boards. A main oil tank is fixed on the other end of the lower die, and the lower end of the main oil tank is fixed on a support shaft on the lower portions of the right and the left lateral boards. The main oil tank and the assist oil tank hang the lower die between the right and the left lateral boards in the air. A rear roller device and a front roller device are fixed on a bottom board, the lower die is fixed on the upper portion on the rear end of the bottom board, and a lower die return device is fixed on the front end of the lower die. The utility model has the advantages that the requirement of a heavy caliber steel pipe bent pipe is satisfied, the stress on the underside of a steel pipe is even, the ovality of the steel pipe is guaranteed, and damage to an anticorrosive coating is prevented. And the right and the left lateral boards adopt a composite structure of the main board and a muscle board, which guarantee enough intensity, and reduce weight. And the cold bending machine has self-loading and self-unloading function, and a hydraulic adjustable device substitutes a crane to be loaded and unloaded when suspending devices are not provided.