The invention discloses a vehicle-mounted high-precision fluid metering device and a metering management system, and relates to a vehicle-mounted accurate flow metering mechanism, and a vehicle-mounted flow metering real-time management system. The fluid metering device sequentially consists of a section of straight pipe (2), a solenoid valve (7), a section of filling flexible pipe (11) and a filling gun (12); the metering management system comprises a control module, a radio frequency integrated circuit (RFIC) double reader, a liquid crystal display, and an operation panel, a global system for mobile communication (GSM) communication module, a background database management center, a filling vehicle integrated circuit (IC) card, and a filled vehicle IC card. The flow metering device has the advantages of high metering precision, corrosion resistance, high repeatability and abrasive resistance and the like; the metering management system realizes the function of a mobile filling station, and provides a better management platform for a manager. The fluid metering device and the metering management system can accurately meter the flow of the fluid, and are suitable for metering of quantity acceptance and trade settlement of the media which are loaded by an oil tank carrier vehicle and other special liquid carrier vehicles.