The invention relates to the technical field of digital image processing, in particular to a camera shielding detection method. The camera shielding detection method includes the steps of 1, building a camera resource configuration module; 2, enabling a monitoring center to judge whether a camera is in operation or not according to operation state information, and to acquire a current-frame digital image from the camera in the operation state; 3, performing image preprocessing; 4, building an image brightness background, smoothing the image to a smooth brightness distribution diagram by an average filtering method, and extracting possibly shielded sectors Si of the image by a dynamic threshold method; 5, subjecting the possibly shielded sectors Si to connected component analysis, setting a sector threshold value ST, selecting the possibly shielded sectors Si not less than the sector threshold value ST, and defining the selected possibly shielded sectors Si as high-probability shielded sectors S2; 6, computing shielded probability P of the high-probability shielded sectors S2; 7, judging the relation between the shielded probability P and preset shielded probability PT, if P>PT, judging the high-probability shielded sectors as final shielded sectors, and if not, judging the high-probability shielded sectors as unshielded sectors. The camera shielding detection method is high in detection efficiency.