Reinforcing pile for building foundation

The utility model relates to the technical field of building foundations, and discloses a building foundation reinforcing pile which comprises a pile foundation body, an inserting hole is formed in the top of the pile foundation body, a plurality of drainage holes are formed in the lower end of the pile foundation body, the drainage holes are communicated with the lower end of the inserting hole, and piling threads are arranged outside the pile foundation body. A plugging assembly is arranged in the inserting hole; the plugging assembly comprises a plug movably sleeved with the inserting hole, a control piece is arranged in the middle of the plug, a plurality of plugging shafts are arranged outside the control piece, and the ends, away from the axis of the inserting hole, of the plugging shafts are inserted into the drainage hole. Due to the arrangement of the inserting holes, the pile foundation can be conveniently driven into the ground through the pile driving rod under the matching of the pile driving thr