The invention discloses a double-cylinder hydraulic synchronous erecting system. A control system comprises a controller. The controller is connected with two angle sensors in an electrical system in an induction manner. The controller is connected with a rectifier, a first electromagnetic reversing valve and a second electromagnetic reversing valve in a hydraulic system. Angles are collected in real time, a controller can conduct adjustment in real time conveniently, when two hydraulic cylinders have position errors, the automatic control system can send out signals, the opening degree of a proportional valve is adjusted, synchronization is achieved, and due to an adopted balance valve, the influences of pressure fluctuation on the system are greatly relieved. By means of the synchronous erecting system, the purpose of synchronously controlling the two cylinders is achieved from the source through a speed regulating valve loop and an oil supplementing loop. A master-slave driving and classification PID combined control manner is adopted in the synchronous erecting system, and the synchronization precision of the system is greatly improved from the control strategy level. The multiple beneficial effects that the hydraulic control principle of the whole set of system is reasonable and reliable, the electrical control difficulty is low, implementation and operation are simple, and the cost is low are achieved.