The invention discloses a method of adopting a grid to partition a region and analyzing a pollution index change trend reflected by surveillance video data in the grid for tracing the direct haze generation source in real time. The method comprises steps: firstly, grid partitioning is carried out in a region, and a no-haze reference map sample library based on a video image is built for each grid; then, through analyzing the surveillance video image and in combination with the no-haze reference map, based on time sequence analysis, fog and haze are distinguished, and the haze index, the grade, the change trend and the change speed in the surveillance image at the current position are determined; and finally, according to the position of the surveillance video, the haze index, the grade and the trend along with time changes, a haze diffusion path along with time changes is mapped, a grid sequence on the path is further obtained, and finally, a specific pollution source grid and a responsibility subject for the pollution source are determined. The method can be used for timely positioning the direct haze generation source in a specific region, and has the advantages of high recognition precision and high efficiency.