The vehicle-mounted urea filling machine will enter the system. According to the query information, the vehicle-mounted urea filling machine manages multiple self-service urea filling machines through the background management system, which is convenient for management. Vehicle urea filling machine is a kind of equipment for filling urea solution for vehicles, which is supported by the majority of cardholders because of its convenience, quickness, unpacking and no white pollution. According to the market demand and industry trend, automobile urea filling station will become the main way of automobile urea filling.