The invention provides a three-directional geology modeling method based on sparse borehole points, and belongs to a three-dimensional geology modeling method for coal mine geology. The modeling method comprises steps of 1: constructing borehole database, extracting responding base information, generating comparison diagram of a complete drilling layer and an incomplete layer and using the interpolation algorithm of fixed points; 2: setting mark points of transverse virtual drilling holes and forming the whole drilling hole by using the coordinates as input parameters of interpolation based on a prospecting line profile map according to exploration data of stratum trend; 3: using crosscheck as a statistical means to test precision of models according constructed models; and 4: referring to the contour map of one stratum, comparing corresponding stratum data of models and summarizing similarity until the models are modified to a proper confidence level. In the general background of sparse borehole points of a model construction process, other non-borehole data are added, missed borehole data are virtualized, and according to possible errors of constructed models, judging abruptly changed construction methods, thereby improving construction quality of the models.