Abstract: The main coal seams of Guojiatan Coal Mine are the 2^-2,3^-1,4^-3,and 5^-3coal seams. Due to the thick thickness of the upper 2^-2coal seam,strong energy seismic reflection waves are easily formed in the 2^-2coal seam,which has an energy shielding effect on the seismic reflection waves of the lower 3^-1,4^-3,and 5^-3thin coal seams. This article provides a detailed introduction to the principles of multi wavelet decomposition and reconstruction techniques. Based on the geological characteristics of the main coal seam in Guojiatan Coal Mine,a geological model is constructed,and seismic forward simulation is carried out using the acoustic wave equation. The use of geological model forward modeling to simulate seismic records for multi wavelet decomposition and reconstruction technology has been tested and analyzed. It is believed that this method can effectively extract high-energy seismic reflection waves. After removing high-energy seismic reflection waves from seismic data,the energy of deep thin coal seam seismic reflection waves is relatively enhanced,thereby improving the ability of seismic exploration to identify thin coal seams. The application of multi wavelet decomposition and reconstruction techniques to the actual 3D seismic data processing of Guojiatan Coal Mine has achieved good results.