The invention discloses a method for constructing a template supporting platform with a spatial span wire structure, which comprises the following steps that: the mounting of a cantilever platform, the mounting of a central rigid annular cylinder, the mounting of a thread steel bar bearing cable, the mounting of a simple truss, the mounting of a lateral strut on the simple truss and a steel ring strut on the central rigid annular cylinder and the like. The built template supporting platform with the spatial span wire structure has a reasonable structure, convenient construction and good effect.