The invention provides a human body three-dimensional scanner of which the module quantity can be increased. The scanner comprises an annular main scanning box (1), top scanning boxes (2), top lamp boxes (3), a scanning module (4) and a light module (5), and the scanner is characterized in that the annular main scanning box (1) comprises a plurality of sub scanning boxes (11) and a scanning box connecting rack (12) connecting the sub scanning boxes (11), the plurality of top scanning boxes (2) and the plurality of top lamp boxes (3) are arranged on the top of a sub scanning box frame (111), the top scanning boxes (2) and the top lamp boxes (3) are uniformly distributed at intervals to form an annular structure, and a top reflective board (23) and a top LED lamp box (32) face the central line of the annular structure. The human body three-dimensional scanner is provided with a whole structure with modularization, integration and enclosing, the scanning box quantity can be quickly increased and decreased, the scanning equipment is highly integrated, and quick, efficient and low-cost scanning for human bodies is achieved.