Slotting target identification method and system for building robot

The invention provides a slotting target identification method and system for a building robot, and the method comprises the steps: carrying out the Hough circle detection of an obtained binary mask image, judging that a circular hole mark is identified when the contour radius is detected to be within a preset threshold range, obtaining the coordinates of a circle center closest to the center of a visual field, and entering the next step; otherwise, directly entering the next step; contour detection is carried out on the binary mask image, minimum rectangular frame fitting is carried out on a target contour, when the length, width and length-width ratio of a rectangular frame are in a threshold range and the rectangular frame meets line segment features, it is judged that a groove mark is recognized, coordinates of the two ends of a line segment closest to the center of a visual field are obtained, and the next step is carried out; otherwise, judging whether a round hole mark is detected, if so, entering the