The invention relates to a moving image processing device and a moving image processing method. The device and the method are based on an atmosphere model so that videos in foggy days are clear, the image visibility is improved, and in addition, the real-time processing requirements of the images can be preferably met. According to the moving image processing device, in the video defogging process, the video is divided into a core frame used as a main frame and an ordinary frame used as a sub frame, the core frame is calculated again to be used as a distance parameter t(X) and an unplugged point parameter A, the ordinary frame is not subjected to A calculation, and the A of the core frame is used, the t(X) of a region corresponding to the core frame is used for the background part of the ordinary frame, and the t(X) is calculated again for the foreground part of the ordinary frame. According to the device and the method, the application speed of the single-frame image defogging algorithm based on the atmosphere model in the defogging clarifying processing on the moving images such as videos and the like can be accelerated, a good defogging effect can be obtained, and in addition, the real-time performance of the moving images is ensured.