The invention discloses a cultural relic three-dimensional modeling method which comprises the following steps of S1, shooting environment preparation, S2, cultural relic surrounding acquisition, S3,cultural relic orientation angle adjustment to realize omnibearing acquisition, S4, data preprocessing, and S5, cultural relic three-dimensional automatic modeling, and relates to the technical fieldof image acquisition. The invention discloses the cultural relic three-dimensional modeling method, cultural relics are comprehensively collected and automatically positioned, the one-time overall three-dimensional modeling of the cultural relics can be realized, the problem that three-dimensional modeling of the bottom and the lower portion of the cultural relic needs manual participation, and consequently the precision of a three-dimensional model is not uniform is solved, the refined three-dimensional modeling of the cultural relic with the small size and thickness is achieved, and therefore, the modeling time is greatly shortened, the application range of three-dimensional modeling is enriched, and the three-dimensional digitization work of the cultural relics can be promoted and developed.