1. A human body three-dimensional imaging method comprising the following steps: step A: upon receipt of a collection instruction from a control center, a plurality of control base stations performing coding pattern projection for a human body, and meanwhile collecting human body image information observed from their respective view angles; and each of the control base stations performing depth computation for its respective human body image information to obtain three-dimensional geometric depth data in their respective local coordinate systems; wherein the plurality of control base stations are interconnected, and are deployed surrounding the human body to form a measurement space completely covering the human body, each control base station comprises two longitudinally arranged three-dimensional sensors respectively, wherein the two three-dimensional sensors are respectively configured to acquire three-dimensional geometric depth data and texture data of an upper part and a lower part of the human body from the view angle of the control base station; step B: each of the control base stations transforming the three-dimensional geometric depth data from its local coordinate systems to a global coordinate system; step C: each of the control base stations performing white light projection to the human body, collecting texture data of human body colors observed from its view angle, and sending the collected texture data together with the three-dimensional geometric depth data transformed in step B to the control center; and step D: the control center receiving the three-dimensional geometric depth data and corresponding surface texture data thereof in the global coordinate system transmitted by all the control base stations, splicing the three-dimensional geometric depth data collected by the control base stations to obtain a human body three-dimensional model, removing redundancy for an integral model of the human body to obtain a fused human body three-dimensional model; thereafter the control center performing a weighted operation for texture data of an overlapped portion of all human body colors that is collected by the control base stations to obtain fused texture data; and the control center associating the fused human body three-dimensional model with the fused texture data.