Aiming at the issues of low efficiency, discontinuity and difficulty of reproducing the original data of geological sketch in tunnel construction, the idea of threedimensional(3D) reconstruction of tunnel excavated rock mass combined kinect sensor with kintinuous algorithm is proposed. The method solves the storage format and integrityproblem of original data in the geological sketching process and improves the working efficiency of identifying geological attributes. Through the physical model tests, the parameters of the 3D reconstruction process of the tunnel are determined. The field test results shows that the method is better in the global robustness and detail reduction of the reconstruction model, and the error is controlledwithin 1.9%~2.5%. In short, the method has advantages of high visibility, strong continuity of data and simple operation, which can provide an efficient and accurate method for geological sketching of tunnel engineering, withwide range ofpromotional application value.