The pre-processing and automatic weighing system is suitable for discharging, milling, sifting, dispensing, and other operations of raw materials, and can be used in the pharmaceutical and food industries. This system is including bag dump station, vacuum conveyor, sifting system, milling system, automatic dispensing and weighing system, dispensing down-flow booth, dust collector, etc; Intelligent management and control system is utilized to realize coordinated operation of various functional modules.