Foundation pit precast pile connecting structure

The utility model relates to the field of precast piles, and discloses a foundation pit precast pile connecting structure which comprises an upper column, a middle column and a lower column. A steel pipe with the diameter smaller than the inner diameter of the middle column is arranged in the middle column, concrete is poured in the steel pipe, and a grouting space used for pouring cement paste is formed in the area between the steel pipe and the upper column and the area between the steel pipe and the lower column. The bottom of the middle column is connected with a rubber ring, the outer side of the rubber ring is attached to the inner side of the middle column, the bottom end of the rubber ring is connected with a tray, and the outer side of the tray is attached to the bottom side of the middle column; and a fixing mechanism for fixing the steel pipe is arranged on the middle column. In the utility model, the middle section of the precast pile consisting of the upper column, the middle column and the lower