The invention discloses a knowledge-driven bedrock surface three-dimensional model construction method and device, and the method specifically comprises the steps: firstly, obtaining a bedrock exposedboundary line based on a geological map of a research area; secondly, based on the bed rock exposed boundary line, cutting to obtain a bed rock buried area Dem and an exposed area Dem; then, based onthe drilling point data, according to the landform type, constructing a virtual drilling hole and a bed rock burial depth contour line; finally, based on the bed rock burial depth contour line and the drilling point data, acquiring a bed rock surface three-dimensional model of each landform unit by interpolation, and after the bed rock surface three-dimensional model is combined with Dem of the bed rock exposed area, acquiring a complete bed rock surface three-dimensional model of the research area. The invention realizes a method for relatively accurately constructing the bedrock surface three-dimensional model based on the geoscience knowledge law under the condition that the drilling data is relatively sparse. Compared with the prior art, bedrock surface modeling precision of the drilling sparse area is improved to a certain extent.