Material taking and unloading method and device based on visual positioning

The invention relates to the technical field of logistics production, in particular to a material taking and unloading method and device based on visual positioning. The method comprises the following steps: S1, carrying out image data acquisition on a target object in a visual field range through coarse positioning visual equipment; s2, calculating the image data of the target object, dividing a working area, and calculating a geometric center coordinate of the target object in a single working area; s3, the robot arm carries the fine positioning visual device to move to a single working area, and image data of a target object in the working area is obtained; s4, calculating the contour and the position of a target object in the working area, and outputting the geometric coordinates of the target object; and S5, the robot arm transports to the accurate position of the target object, takes down the target object and unloads the target object. The robot arm is guided to automatically and accurately take materi