The present invention provides a method for automatically planning the shortest evacuation escape route, comprising obtaining a plurality of cells determined in a region to be searched in predetermined unit square area, and marking each cell, wherein the cells where no actual obstacle exists are marked as 0, otherwise the cells are marked as 1; in the region to be searched, determining the corresponding cells and positions occupied by a lamp and an exit sign, and calculating the minimum number of cells covered by a route from the lamp to the exit sign so as to obtain the optimal route; and transmitting the obtained optimal route to the lamp for display. The method can automatically plan the route by a function of intelligently and automatically planning the shortest route, and achieves a purpose of correctly indicating the direction and shortening the indicating time.