The invention relates to a floor sweeping robot. The floor sweeping robot comprises a shell, a walking mechanism, a cleaning component, a driving assembly and a mopping assembly. The mopping assembly comprises a rag, a transmission element and a cleaning box with a cleaning element. When the driving assembly drives the walking mechanism to move along the floor, at least part of the rag makes contact with the floor so as to clean the floor. When the part, making contact with the floor, of the rag becomes dirty, the transmission element drives the rag to move under the drive of the driving assembly, so that the dirty part enters the cleaning box. In the cleaning box, the cleaning element cleans the dirty part of the rag. The rag penetrates through the cleaning box, so all parts of the rag can be cleaned. The process is repeated, and the dirty part of the rag can be cleaned in time, so that the part, making contact with the floor, of the rag is always kept clean. Therefore, the floor sweeping robot can achieve self-cleaning, and secondary contamination of the floor is effectively avoided.