The invention discloses a fuel oil filling device for engineering vehicles and a fuel oil filling management system thereof, relating to a precise-metering mechanism for vehicle-mounted flows and a real-time management system for vehicle-mounted flow metering, wherein the precise-metering mechanism for vehicle-mounted flows is composed of a fluid metering device and a metering management system; and the real-time management system for vehicle-mounted flow metering is composed of a fuel oil filling device for engineering vehicles and a fuel oil filling management system thereof, wherein the fuel oil filling device for engineering vehicles comprises a filter, a getter device, a rectifier and a flowmeter, and can guarantee the accuracy of oil filling; the fuel oil filling management system carries out identification, acquisition and recording on vehicle information, personnel information and oil quantity information by using RFID (radio frequency identification devices), GPRS (general packet radio service) and Zigbee wireless communication systems and the like, and sends the information to a distal background database management center, thereby providing a technical platform for optimal management implementation for managers.