The invention discloses a self-service settlement checking method and system. According to the method, a mobile self-service settlement device is used for carrying out settlement on purchased commodities, commodity information in the self-service settlement device is collected in real time through a checking area, and the self-service settlement device wirelessly outputs the settled commodity information; the two kinds of information are compared and checked, and whether the two kinds of information are consistent or not is judged. The system comprises the mobile self-service settlement device, a settlement data sending module, a settlement data receiving module, a data acquisition module and a comprehensive data processing module. False settlement and missed settlement in self-service settlement are prompted, an alarm is given about the unsettled commodities, the problems of omission or errors and the like during pure self-service settlement are solved, the commodity safety problem during unattended sales is solved, the self-service shopping process is improved, and the self-service settlement checking system can be used for self-service selling or unattended sales of places suchas stores, supermarkets and shopping malls and has the advantages of being low in cost, convenient to deploy and capable of being conveniently integrated into an existing commercial environment.