The invention relates to a three-dimensional reinforcing steel bar lofting method. The three-dimensional reinforcing steel bar lofting method includes the specific steps that 1, a concrete member solid model is generated through three-dimensional modeling software, 2, the types and the lap joint lengths of reinforcing steel bar connectors are preset according to the design and standard requirements for reinforcing steel bars; 3, the types and the number of the connectors are automatically calculated according to the positions of the reinforcing steel bars and the selected types of the connectors, and corresponding connector type models are generated at the lap joint positions of the reinforcing steel bars; 4, after the positions of the connectors are partially adjusted, the related positions of the connectors and the whole model are automatically updated through refreshing; meanwhile, generation of three-dimensional or two-dimensional material lists are supported, and the statistics of the quantity of reinforcing steel bars is carried out in real time. By means of the three-dimensional reinforcing steel bar lofting method, blanking in the three-dimensional model mode can be achieved; as for complex members, observation can be carried out in any direction, any sectioning can be carried out, and a reinforcing steel bar arrangement person can conveniently learn drawings; due to consideration of the positions of the reinforcing steel bar connectors, calculation of the construction quantity can be sufficiently achieved, project cost is saved, and workloads are reduced.