Double-hydraulic-cylinder synchronous control system for lifting and lowering petroleum drilling machine

The utility model discloses a petroleum drilling machine lifting and lowering double-hydraulic-cylinder synchronous control system which comprises two hydraulic cylinders which are installed in a bilateral symmetry mode, the hydraulic cylinders obtain oil liquid through oil supply pumps communicated with an oil tank, the oil supply pumps on the left side and the right side are connected in series, and an electric proportional reversing valve is installed on an oil supply pipeline. A hydraulic cylinder balance valve and a displacement sensor which are connected with a hydraulic cylinder piston are installed on the outer wall of the hydraulic cylinder body, the electric proportional reversing valve, the displacement sensor and the hydraulic cylinder balance valve are connected with a PLC, and the PLC is connected with a remote controller and a local controller. And an electric proportional reversing valve control button, a synchronous lifting/descending operation knob and a manual/automatic switching button are