The invention relates to a rapid defogging method, comprising the following steps of: solving for the RGB (Red Green Blue) minimum of each pixel point to obtain a grayscale image, carrying out minimum filtering on the grayscale image to obtain a dark primary-color image, estimating atmospheric parameters by using the dark primary-color image, uniformly selecting some points in the image to solve for transmissivity, carrying out binary bilinear regression analysis to obtain the transmissivity of all points of the image, and recovering a fog-free image according to the transmissivity and the atmospheric parameters. The algorithm provided by the invention has the characteristics of good processing effect and high speed, and can be easily applied to systems with higher requirements on real-time property.