When compressed air is supplied to the vacuum generator, the vacuum generator generates negative pressure to form a vacuum airflow, and the material is sucked into the suction nozzle to form a material airflow, and reaches the hopper of the feeder through the suction pipe. The air is completely separated. When the material is filled into the silo, the controller will automatically cut off the gas source, the vacuum generator stops working, and at the same time the silo door opens automatically, and the material falls into the hopper of the device. At the same time, the compressed air automatically cleans the filter through the pulse blowback valve. When the time is up or the material level sensor sends a material signal, the material feeder is automatically started.