Hydraulic control system and method for positioning index plate

According to the hydraulic control system and method for positioning the index plate, the requirements of a machine tool and different index plate specifications can be met, the application range is wide, the service life of the index plate is prolonged, the product quality is improved, the production progress is accelerated, cost is saved, and the structure is simple. The numerical control unit identifies signals of the index plates of different specifications and sends driving instructions corresponding to the index plates to the driving unit; the output end of the driving unit is connected with the index plate and used for outputting hydraulic pressure to control the index plate to loosen, and a plurality of pressure reducing valves, a first electromagnetic valve and a second electromagnetic valve are sequentially arranged on a connecting pipeline of the driving unit and the index plate. The plurality of pressure reducing valves are used for correspondingly adjusting the hydraulic pressure output by the dr