The invention discloses a tooth blank finish turning hydraulic tool system which mainly consists of a bearing sleeve, a rotary oil cylinder, a pull rod, a connecting sleeve, a connecting rod, a finishturning tire sleeve, a tooth blank, a finish turning tire seat, a flange plate, a connecting plate, a locating sleeve, a spacer bush, a corresponding hydraulic system and the like; the front end of the pull rod is connected with the connecting rod; the connecting sleeve is arranged at the tail of a spindle, and after alignment, the special rotary oil cylinder and the pull rod (which penetrates through a spindle hole) are arranged on the connecting sleeve; the connecting plate is arranged at the front end of the spindle of a lathe; finish turning tire sleeves in different sizes can be mountedon the finish turning tire seat as required so as to meet the requirement of machining the tooth blanks in various sizes; the finish turning tire seat is arranged on the flange plate in an alignment manner; and after the connecting plate is aligned, the flange plate is arranged on the connecting plate. The tooth blank finish turning hydraulic tool system is simple in structure, high in working efficiency, simple and convenient in clamping, wide in clamping range, adjustable in tensioning force and high in precision and can meet the finish turning requirements of the tooth blanks better.