Novel piling immersed pipe with strong single pile bearing capacity

The utility model discloses a pile-forming device of a sinking pipe prefabricated steel concrete expanded bore pile, in particular to a pile-forming sinking pipe which is matched with various sinking pipe prefabricated steel concrete expanded bore piles. The sinking pipe is formed by a hollow tubular pipe body, a bottom and a metal pile head, wherein, the inside of the bottom is provided with a positioning groove matched with the positioning steel feet of the excavation devices, and the front end of the metal pile head is provided with a metal probe; the section of the tubular body is a square, the tubular pipe body is designed into a multiple-section structure, the sections are riveted mutually by rivets; the section of the connection between two sections is an outer-square and inner-circle shape. The sinking pipe can reduce manufacturing cost, simplify the manufacturing technics and ensure the proportion between the pipe body and the inner diameter of the bottom, and the positioning groove has enough depth.