Exactly located novel piling immersed tube suitable for mud layer

The utility model discloses pile-forming equipment of an immersed tube precast reinforced concrete enlarged pile, in particular relates to a pile-forming immersed tube applicable for the use in silt stratification, and the pile-forming immersed tube consists of a hollow pipe body and a bottom. A positioning slot that is matched with the positioning iron feet of excavation equipment is arranged inside the bottom, and the lower part of the pipe body is sleeved with a sealing ring. The utility model removes guide wings, reduces production costs, and simplifies the production technique. Compared with the prior art, the utility model not only ensures the proportional relation of the pipe body and the bottom diameters, but also makes full use of the useful space inside the guide wings, thereby ensuring that the positioning slot has sufficient depth, resulting in easy access into the slot for the positioning iron feet of an excavation and enlarging device, having the advantages of accurate positioning, solidity and