This invention relates to a method by vacuum, outside liquid will be pumped into the vehicle tank of vacuum suction liquid vehicle, including body, the body with the power device, the vehicle tank is installed in the body, in the car is equipped with air compressors, the power device connects with the air compressor by V-belt I, air compressor connects with the brake gas tank through the pipeline I, the brake pipe gas tank connects with the pressurized gas tank by the pipeline IV, pressurized gas tank connects with the tank through the pipeline III, the power device connects with the clutch device by V-belt II, which is installed in the pump device, the pump connects with the tank through the pipeline II, a tank connects with the material pipe, between the material and the mouth is set a valve, the structure is small size, low price, to rural purchasing power, vehicle adaptability strong, safe, reliable, and simple operation advantages, suitable for using in the vast rural areas.