The utility model discloses a pneumatic hanging barrier device for underground inclined roadways, which is characterized by comprising an air cylinder hung on the top of a roadway. A telescopic end of a push rod of the air cylinder is connected to the middle of a barrier through a 'T'-shaped connector, the upper portion of the barrier is connected onto a crossbeam through a 'U'-shaped clamp, and the barrier is capable of rotating in the vertical plane with the crossbeam serving as a rotary shaft. The pneumatic hanging barrier device is convenient in operation, safe and reliable, and safety of a roadway evacuating and transporting system can be promoted effectively.