In view of the difficulties of updating 3D geological model caused by multi-person collaboration, tedious measurement process and low efficiency in traditional traverse survey of working face, a dynamic revision technology of geological model based on coal-rock boundary geological recording device is proposed. Firstly, the geological model of the working face is constructed by collecting the relevant geophysical exploration, drilling, supplementary exploration data and roadway development information.Then the geological recording device is used to measure the coal rock boundary at the current mining position of the fully mechanized mining face, and the coordinates of the coal rock boundary point on the top and bottom of the coal seam are obtained.Finally, the measurement results of the coal-rock boundary point are imported into the established initial geological model, and the dynamic update of the 3D geological model of the working face is completed through the automatic reconstruction function of the model, and the geological body in a certain range in front of the current mining position of the working face is finally realized.The application of the above method finally meets the demand of adaptive coal cutting in fully mechanized mining face of Coal Mine.