The invention discloses a hydraulic type
grinding machine feeding positioning device. The hydraulic type
grinding machine feeding positioning device comprises a rotary portion, a
tail seat positioning portion, a feeding portion, a gas transportation portion and a reset spring, wherein the rotary portion is arranged on a
machine frame of a
grinding machine, a second end of the rotary portion is used for positioning a workpiece, the
tail seat positioning portion comprises a
tail seat tip and a tail seat drive portion, the tail seat drive portion is arranged on the machine frame, the tail seat tip is arranged on the tail seat drive portion, the feeding portion comprises a bearing portion, a lifting portion, a positioning
assembly and a moving portion, the moving portion is arranged on the machine frame, the lifting portion is arranged on the moving portion, the bearing portion is arranged on an output shaft of the lifting portion, the bearing portion is provided with a positioning face for positioning the workpiece, the positioning
assembly is arranged in a containing cavity in the bearing portion, a first end of a fixed block in the positioning
assembly is connected with a first end of the containing cavity, a first end of a push-out block of the positioning assembly is connected with a second end of the fixed block, the push-out block, the fixed block and the inner wall face of the containing cavity cooperate to form a sealed cavity body, a second end of the push-out block is connected with the workpiece, the gas transportation portion communicates with the sealed cavity body, a first end of the reset spring is connected with the push-out block, and a second end of the reset spring is connected with the containing cavity.