Abstract: This paper introduces the design and implementation of video image fast defogging device. The device takes the SoPC (system on a programmable chip) chip of zynq series as the development platform to analyze the algorithm of dark channel prior based on physical model and then to optimize it. A downward minimum solver is designed to achieve the implementation of logic of single image haze removal algorithm, and a video defogging algorithm is proposed based on the average value of interframes pixels. By optimizing the defogging algorithm, the portability of the algorithm is increased. At the same time, the speed of algorithm operation is improved by using acceleration technology. The fast defogging process of single image and real-time defogging process of video image are realized, protecting the outdoor imaging system from fog effectively, which is of very important scientific and engineering significance.