Method and system for judging deviation from preset action route

The invention relates to a method and a system for judging deviation from a preset action route. The method comprises the steps of presetting a belt-shaped action area on an electronic map, determining the center line of the belt-shaped action area, and partitioning the center line by taking the preset length D as step length to obtain a plurality of discrete segmentation points, wherein the preset length D is not smaller than the half of the width of the action area; acquiring the position information of a practical action point; according to the position information of the practical action point, respectively calculating the distances between the practical action point and the plurality of segmentation points; respectively comparing the distances between the practical action point and the plurality of segmentation points with the preset length D; and if one of the distances between the practical action point and the plurality of segmentation points is less than or equal to the preset length D, judging that