Four-turning numerical control machine tool chuck working by hydraulic pressure

The utility model provides a four-turning numerical control machine tool chuck working by hydraulic pressure, comprising a hydraulic clamping system and a hydraulic turning system, wherein the hydraulic clamping system comprises a first oil passage, a second oil passage and a top cylinder clamping device that is controlled by the first oil passage and the second oil passage; the top cylinder clamping device comprises a top cylinder end cover, a top cylinder sleeve and a top cylinder that is linked to the top cylinder sleeve; the hydraulic turning system comprises a third oil passage, a fourth oil passage, a fifth oil passage, a sixth oil passage, a first push rod and a second push rod acting under the control of the third oil passage, the fourth oil passage, the fifth oil passage and the sixth oil passage, and a reversing rotary shaft rotating under the control of the first push rod and the second push rod. By adopting the technical scheme, the surfaces of a workpiece needing to be machined in all directions