The utility model relates to a steel tube unit with pullable steel bar in front of drainage board. When the prior art is used to treat the soft foundation, ten thousands of steel bars are left under the ground with the draining board, and a plurality of steel is wasted. The front end of the steel tube is provided with a wall eye, one end of the steel bar is also provided with a wall eye, and the wall eye of the steel tube is connected with the wall eye of the steel bar by a soft rope. The soft rope is wire rope. Because the utility model is adopted, the steel bar is pulled out together with the steel tube when the steel tube is pulled out, the draining board is left under the ground, a plurality of steel bars are saved, and construction cost is reduced.