The invention relates to the technical field of three-dimensional modeling, in particular to a large-scale cultural relic three-dimensional modeling method which comprises the following steps of S1 basic treatment of large-scale cultural relics characterized in that a worker cleans the surfaces of the large-scale cultural relics by using a professional tool, and executes S2 if the surfaces of thelarge-scale cultural relics are damaged or notched; if the surface of the large cultural relic is not damaged or nick, executing the step S3; S2 restoration of the large cultural relics characterizedin that for the large cultural relics with notches, workers repair the surfaces of the large cultural relics by using a professional tool, for the damaged large cultural relics, the workers look up and browse historical data related to the large cultural relics, and then repair the damaged large cultural relics by using the professional tool. According to the method, manpower is saved, the modeling efficiency is high, the modeling efficiency is good, and the large-scale cultural relics can be well modeled.