A fastening combined pile manufacturing device comprises a concave V-shaped head drilling machine and a hexagon drilling machine. A plurality of concrete concave V-shaped head piles are manufactured, and the distance between every two adjacent concrete concave V-shaped head piles is equal to the height of the hexagon section of a hexagon pile; the hexagon pile drilling machine is used for manufacturing one cement soil hexagon pile on the front portion and one cement soil hexagon pile on the rear portion of the space between every two adjacent concave V-shaped head piles respectively according to the working mode of the hexagon pile drilling machine, in this way, a pile wall with a plurality of concrete concave V-shaped head piles and cement soil hexagon piles in a mutual fastening manner is formed to be used for earth retaining and leakage prevention of a building foundation, wherein the two cement soil hexagon piles between every two adjacent concave V-shaped head piles are arranged in tandem.