Modular hydraulic control valve with self-locking function

The utility model relates to a modular self-locking hydraulic control valve, which comprises a reversing control part and a self-locking control part, the reversing control part comprises a valve plate, an oil inlet pipeline is arranged in the valve plate, a first electromagnetic valve and a second electromagnetic valve are fixed on the valve plate, the self-locking control part comprises a valve block, a hydraulic control reversing valve is arranged on the valve block, and the hydraulic control reversing valve is connected with the self-locking control part. The hydraulic control reversing valve is provided with an oil inlet P and two oil outlets P1 and P2, an oil way channel is further arranged in the valve block, an oil outlet P3 is further arranged on the oil way channel, the valve block is further provided with a low-speed-gear connector and a high-speed-gear connector, the oil outlet P1 is communicated with the low-speed-gear connector, the oil outlet P2 is communicated with the high-speed-gear connecto