Pneumatic cigarette conveying device and method and cigarette production line

The pneumatic cigarette conveying device comprises a cigarette air distribution block, a cigarette guide block is fixed to the bottom face of the cigarette air distribution block, the cigarette air distribution block is provided with a plurality of first cigarette channels to receive cigarettes falling from a mold, and the cigarette guide block is provided with a plurality of second cigarette channels; the second cigarette channels are communicated with the corresponding first cigarette channels, guide pipes communicated with the second cigarette channels are arranged on the bottom face of the cigarette guide block, each second cigarette channel is connected with an air blowing channel formed in the cigarette guide block, a set acute angle is formed between each air blowing channel and the corresponding second cigarette channel, and the height of the air inlet side is larger than that of the air outlet side. The air blowing channel is communicated with an air inlet channel formed in the cigarette air distribu