The invention discloses a method for automatically generating a multi-device power path schematic diagram. The method comprises the following steps: analyzing the device on each path, and extracting and merging the same devices on the paths by utilizing a merging algorithm so as to abstracting paths with shared information; equivalently dividing a canvas into grids which are distributed in lines and rows and traversing the devices on the paths; calculating the grids where the devices are located by utilizing a layout algorithm; after determining the grids of the devices, laying out a connecting line; determining the direction and coordinates of the connecting line according to a topology connection relationship among the devices; converting the devices and the connecting line coordinates into drawing coordinates on the canvas; and finally drawing the final schematic diagram. According to the method, a general power supply schematic diagram can be rapidly and automatically drawn according to the power supply paths of a plurality of devices, so that the display limitation of the single-path power supply path schematic diagram in the power protection business is solved, the perceptual intuition and convenience of the diagram are ensured, and the high making efficiency of power protection scheme is ensured.