Protection ventilation device and method

The invention discloses a protection ventilation device and a method, and belongs to the technical field of protection engineering. The protection ventilation device comprises a display control unit and a ventilation cabinet unit, the display control unit comprises a control interface circuit, a rectifier and a direct-current power supply distributor, a detector interface circuit, an AD conversioncircuit, an FPGA processor, an ARM processor and a touch display screen; the ventilation cabinet unit comprises a cabinet body, a filter, a first cleaning valve, a second cleaning valve, a three-proofing machine, a three-way box assembly, a first filter valve, a second filter valve, a micro differential pressure detector and a filter absorber, wherein the first cleaning valve, the second cleaningvalve, the three-proofing machine, the three-way box assembly, the first filter valve, the second filter valve, the micro differential pressure detector and the filter absorber are arranged in the cabinet body; air filtration