The invention discloses an automatic refueling and expense settlement completing system for an automobile. The system integrates technologies and applications, such as computer software/hardware, an RFID (Radio Frequency Identification) technology, wireless communication, information acquisition, data transmission, network communication, automatic control, network payment and a ranging and positioning system. According to the system, an on-board computer is used for acquiring the volume of a fuel carried by the automobile and transferring data to a database through the Internet of vehicles, so that automobile carried volume can be examined through a mobile terminal; if the fuel is required to be added, ordering and the prepaying of corresponding expense can be completed through the mobile terminal, then, a corresponding user is navigated to a gas station, an automatic refueling system acquires information on a vehicle electronic tag through the RFID technology so as to realize automobile identity identification, then, refueling and information acquisition are completed automatically, and refueled settlement is completed. The system has the advantages that the whole process is carried out automatically, the safety, service level and efficiency of a refueling process are increased, the charge management is simplified, the environmental pollution is lowered, labor is saved, and the like.