The application discloses a method and device for processing a pallet stack image and a system for storage picking, related to the field of computer information processing. The method for processing the pallet stack image comprises the following steps: obtaining a three primary color image and a depth image of a pallet stack; generating stack data through the three primary color image and the depth image, wherein the stack data is four-channel image data; inputting the stack data into a recognition model to obtain a recognition result, wherein the recognition result includes pixel coordinatesof a top carton in the pallet stack; and performing coordinate mapping on the recognition result to obtain parameters of the pallet stack. According to the method and device for processing the palletstack image and the system for storage picking disclosed by the invention, the combination of a depth camera and a color camera is used for realizing accurate identification of the stack shape, whichbenefits a robot to carry out the stack demolition and subsequent work.