The invention discloses a self-switching tee joint for an oil pipe. The self-switching tee joint is characterized by comprising a circular tube-shaped valve body, a sealing cover plate, a screw and a sealing ball, wherein the upper end of the circular tube-shaped valve body is provided with an inner thread joint, and the lower end of the circular tube-shaped valve body is provided with an outer thread joint; the inner thread joint and the outer thread joint are respectively connected with the end of the oil pipe by thread; the sealing cover plate is fixedly arranged in the circular tube-shaped valve body by the screw; the sealing cover plate is provided with an upper end liquid inlet; the circular tube-shaped valve body is provided with a side wall liquid inlet and a lower end liquid outlet; the circular tube-shaped valve body is internally provided with a ball channel communicated with the side wall liquid inlet and the upper end liquid inlet; the sealing ball is arranged in the ball channel; the lower end liquid outlet is communicated with the ball channel. After the structural form is adopted, inlet liquid can be switched between the side wall liquid inlet and the upper end liquid inlet under the hydraulic action.