Compressed air foam static mixer

The invention relates to the technical field of fire extinguishing equipment, in particular to a compressed air foam static mixer which comprises a pipe body, a stock solution pipe and a compressed air pipe, the pipe body is provided with a water inlet and an outlet, and a turbulent flow cavity, a rectification cavity and a pressurization mixing cavity are sequentially arranged in the pipe body in a communicating mode in the direction from the water inlet to the outlet; a spoiler is arranged in the spoiler cavity, a plurality of through holes are formed in the spoiler, and the end, inserted into the pipe body, of the stock solution pipe is located between the water inlet and the spoiler. According to the embodiment of the invention, by changing the position of the compressed air pipe and arranging the pressurizing mixing cavity with the inner diameter gradually increasing in the direction pointing to the outlet of the pipe body, the situation that the pressure difference is too large after the compressed air