The invention discloses a block-based accumulated vehicle parking detecting method. The method mainly comprises binarization segmentation of a target area and parking detection determination. In the method, the vehicle parking detection is performed on the basis of a block, a target and a background image can be accurately segmented through block-based binarization segmentation, the influences of shadows, illumination and the like are reduced, and the accuracy of subsequent event determination is improved; simultaneously, based on the block processing, the method has the advantages of short detection time and the like and is easy to implement; and by the method, the abnormal parking on an expressway can be detected in real time, and secondary accidents can be effectively prevented.