The invention provides a constraint reinforced cement soil pile forming method. The constraint reinforced cement soil pile forming method mainly includes following steps: 1) preparing before construction; 2) manufacturing a prefabricated annular pile tip and a cylindrical constraint body; 3) placing a pile machine in position; 4) stirring sprayed concrete so as to sink the sprayed concrete; 5) forming a pile bottom enlargement end; 6) stirring the sprayed concrete so as to rise the sprayed concrete; 7) repeating the steps of sinking and rising the sprayed concrete through stirring; 8) supplementing grout at the pile top. The constraint reinforced cement soil pile forming method has the advantages of 1) effectively improving compressive strength of the cement soil pile and improving bearing capacity due to the fact that the cylindrical constraint body is arranged on the outer side of a cement soil pile and generates constraint effects; 2) strengthening reinforcement effects of the upper half of the pile body of the cement soil pile due to the fact that breaking points of the cement soil pile are usually located on the upper portion of the pile body and the upper portion of the cylindrical constraint body is provided with a carbon fiber cloth bag; 3) conveniently connecting the prefabricated annular pile tip with the cylindrical constraint body in binding mode due to the fact that an annular connection steel bar is arranged on the upper portion of the prefabricated annular pile tip; 4) effectively enhancing bearing capacity of the pile body due to the fact that the enlargement end is arranged at the pile bottom of the cement soil pile.