A weathered layer granite rare earth ore three-dimensional geologic construction method comprises the following steps that (1) exploration data of a plurality of exploration holes are obtained, drilling data are extracted from the exploration data, and data integration is carried out according to the drilling data to form modeling data; (2) geological mapping is carried out through modeling data, and a three-dimensional geological map is established according to two-dimensional geological planar graph data; (3) establishing a main three-dimensional geological structure design profile of the rare earth ore through crossing, blocking and layering, and revealing the underground geological condition of a profile domain; and (4) generating a stratum entity through the stratum profile, extracting stratum data from the exploration data, taking the stratum data as project parameters of the stratum entity, and generating a three-dimensional geologic model through the stratum entity. According to the method, three-dimensional geological modeling can be effectively and rapidly carried out, and the modeling profile drawing efficiency and the model accuracy are improved by utilizing the adversarial network.