The invention relates to an automatic drawing method, device and system for a structural reinforcement section drawing, and the method comprises the steps: obtaining a plurality of original structuretemplate drawings, and selecting a target structure template drawing from all original structure template drawings according to a preset target drawing proportion; determining basic drawing information according to the target drawing proportion, identifying primitive size information in the target structure template drawing, and obtaining basic component size information according to the primitivesize information; defining reinforcing steel bar basic information, and drawing reinforcing steel bars in the target structure template drawing according to the drawing basic information, the basic component size information and the reinforcing steel bar basic information to obtain an initial reinforcing steel bar section drawing; and according to the drawing basic information, the basic component size information and the reinforcing steel bar basic information, carrying out character marking and size marking on each reinforcing steel bar in the initial reinforcing steel bar section drawing,and obtaining a target reinforcing steel bar section drawing. According to the method, automatic drawing of the structural reinforcement section drawing can be completed simply, conveniently and quickly, the workload is small, the consumed time is short, and the design quality and the design efficiency are effectively improved.