The invention aims to provide a concrete beam damage rapid evaluation method based on a
generative adversarial network. According to the technology, firstly, a numerical damage stress cloud picture is generated from a real crack image on a concrete beam, and then damage is quantified and the damage stage of the beam is evaluated by adopting a pure vision method. A traditional method for evaluating the damage of the concrete beam needs a component tension and compression experiment or finite
element modeling calculation, time and labor are consumed, and the method is not economical, however, according to the frame provided by the invention, damage information of a real world and numerical calculation can be obtained at the same time only through a concrete beam crack image shot on site, and the method is very practical. And an engineer is greatly helped to quickly evaluate the damage of the concrete beam.