The invention belongs to dynamic video image fusion methods and discloses a coal mining fully mechanized excavation face dynamic video image fusion method. The coal mining fully mechanized excavation face dynamic video image fusion method comprises the steps that the camera placement axis is selected, and two or more megapixel network cameras are arranged around the camera axis and cover the whole coal mining fully mechanized excavation face; video frame images obtained by the adjacent cameras are required to have an overlapped area of about one third; then obtained coal mining fully mechanized excavation face dynamic videos are fused. The coal mining fully mechanized excavation face dynamic video image fusion method has the advantages that a cascade Hash feature matching algorithm uses two times of Hash mapping, and the feature matching precision and speed are ensured; a parallax tolerate transformation model uses a feature point growth rule and a dynamic programming algorithm, the video fusion speed is increased, the requirements for the positions of the cameras in the video fusion process are reduced, and a good dynamic video fusion effect can still be obtained for cameras with large parallax and large rotation. The coal mining working efficiency is improved, and the coal safe production is ensured.