The invention discloses a coal seam modeling method. The method comprises the following steps: obtaining a plurality of coal seam sections, generating a temporary coal seam three-dimensional model according to the coal seam sections; according to the temporary coal seam three-dimensional model, obtaining a update coal seam section between each two adjacent coal seam sections in the coal seam sections; editing the update coal seam sections; and generating a formal coal seam three-dimensional model according to the edited update coal seam sections and the coal seam sections. The coal seam modeling method of the invention aims at the defect that the one-dimensional bore in the prior art is difficult to accurately reflect the three-dimensional space of coal seam and achieves the aim that a plurality of two-dimensional coal seam sections are used to accurately establish the coal seam model; and as the modeling procedure is relatively simple, the established coal seam model is convenient to update and the established coal seam model can reflect the structure of the real coal seam more accurately.