Drill rod flow dividing short section for tail pipe entering well and tail pipe tripping-in pipe string

The invention provides a drill rod flow dividing short section for drilling a tail pipe into a well, which comprises a shell, a plurality of flow dividing holes, a plurality of flow dividing pipes and a plurality of flow dividing pipes, and is characterized in that the wall of the shell is provided with through flow dividing holes; the throttling unit is concentrically arranged in the shell and comprises a valve seat and a throttling valve body arranged in the valve seat; the connecting cylinder is fixedly connected to the lower end of the valve seat, and an annular space is formed between the connecting cylinder and the radial direction of the shell; the sealing cylinder is arranged at the lower end of the connecting cylinder; the reset unit is arranged in the annular space; wherein the throttling valve body is constructed to be capable of throttling when upward-returning fluid passes through the shaft, so that the connecting cylinder and the sealing cylinder are driven to move upwards to open the flow divid