The invention provides an unattended rapid quantitative vehicle loading model acquisition method and system, a controller and a control method. A vehicle enters a site to register a card, a vehicle number automatic identification system identifies the number of the vehicle and the vehicle with rated vehicle load capacity, and the information is stored; the vehicle enters a weighbridge weighing management system, a weighbridge weighs an empty vehicle, and empty vehicle weight data is transmitted to a database; the vehicle enters an automatic parking system, the automatic parking system pulls the vehicle to reach the loading position at a constant speed, the vehicle is accurately positioned through a positioning system, when the vehicle reaches the position below a sliding groove of the loading position, and automatic loading is controlled through a control system; and after loading is completed, the vehicle enters the weighbridge weighing management system, the weighbridge weighs the weight of the full-load vehicle, the weight of the full-load vehicle is stored and printed, the loading control problem is solved according to rapid quantitative loading of the vehicle, and the loading safety and efficiency are improved.