The invention discloses a full-automatic de-molding mould for an internal thread plastic part. The full-automatic de-molding mould comprises a fixed model chamber plate and a moveable model chamber plate, wherein a mold joint of the plastic part is arranged between the fixed model chamber plate and the moveable model chamber plate; a base plate is connected with the lower end face of the moveablemodel chamber plate; a moveable seat plate is arranged under the base plate; a pouring sleeve is arranged at the top end of a fixed seat plate; a main runner is arranged on the mold joint; a product chamber is connected with the main runner; a threaded mold core is arranged in the product chamber; the threaded mold core is penetrated through the moveable seat plate and extends into the base plate;a hydraulic motor is arranged in the moveable seat plate; the lower end of the threaded mold core is connected with the hydraulic motor through a driving mechanism; the threaded mold core is driven by the hydraulic motor to rotate. According to the invention, the hydraulic motor is placed between the base plate and the moveable mold fixing plate, so that the mold space is saved and the requirement for the tonnage of the injection molding machine is lower. A driving gear is adopted for driving a plurality of driven gears to de-mold and the chamber can be fully designed according to the template space. A rotation-stopping mechanism is adopted for guaranteeing the automatic rotation of the plastic part, a spring is adopted for pushing a stub bar and the adjustment and the repairing are convenient.