The invention relates to a tower footing and tower body structure for a space truss structure with constant strength and a method for forming a tower, and relates to the technical field of the design and installation of wind energy tower steel structure processes. The tower footing and tower body structure with constant strength is characterized by consisting of a three-way space truss structure of which the crossing angles at truss panel points are 60 degrees. The method for forming the tower based on the tower footing and tower body structure with the constant strength is characterized in that: the tower is formed by m sections of tower footings and n sections of tower bodies which have the constant strength. Due to the adoption of the three-way space truss structure, compared with the prior art, the tower has high general stressed uniformity, and has the characteristic of constant strength, high seismic resistance and long service life; due to the adoption of symmetrical modular design, the calculation in the design process is simple, and the transportation and installation are convenient; and the tower meets the requirements of high-speed development of high quality, large volume and high height of wind power stations. In addition, the problems that the conventional steel structure towers at home and abroad are complicatedly designed, computed and analyzed and inconvenientto convey integrally, and are needed to be arranged in coordination with large-scale cranes.