Composite pile for building foundation engineering

The utility model discloses a composite pile for building foundation engineering. The pile comprises an upper pipe pile and a lower pipe pile, a connecting piece is arranged between the lower end of the upper tubular pile and the upper end of the lower tubular pile; the vertical section of the connecting piece is H-shaped; the connecting piece comprises a horizontal plate located in the middle ofthe connecting piece. An upper connecting groove is formed above the horizontal plate; the upper connecting groove is inserted and matched with the lower end of the upper tubular pile; a lower connecting groove is formed below the horizontal plate; the lower connecting groove is matched with the upper end of the lower pipe pile in an inserted mode. A plurality of bolts are arranged on the outer side of the connecting piece; a plurality of bolts penetrate through the connecting piece and are in threaded connection with the upper tubular pile and the lower tubular pile respectively, a U-shaped reinforcing piece is furth