The restaurant ordering system employing RFID of the invention comprises a central database, at least an ordering device, at least a serving device, at least a managing device, at least a RFID customer tag, and at least a RFID dish tag, wherein, the central database is used for storing customer information, personalized menus for frequent customers, payment programs, customer codes and dish codes; the order device further comprises a display and a RFID reader; the serving device further comprises a display and a RFID reader; the managing device further comprises a display and a RFID reader; the RFID customer tag is being used as the customer code; the RFID dish tag is being used as the dish code; and the central database, the ordering device, the serving device and the managing device are connected by an Ethernet.