The invention provides a label pasting prompt control method and device and an express treating system. The label pasting prompt control method comprises the following steps that express information of an express is obtained, and label information of the express is determined according to the express information; a printing device is selected from a plurality of printing devices to serve as a target printing device for printing the label information; the target printing device is controlled to print the label information on label paper, and a label of the express is obtained; whether the express is located on a station corresponding to the target printing device or not is judged, wherein each printing device corresponds to the corresponding station; and when the express is located on the station corresponding to the target printing device, the prompt device is controlled to send prompt information that the label is pasted on the express. According to the label pasting prompt control method and device and the express treating system, the problem of the low express treating efficiency of express treating systems in the related technology can be solved.