Foam proportioning mixer and foam fire extinguishing system

The invention provides a foam proportioning mixer and a foam fire extinguishing system, and belongs to the technical field of fire fighting equipment. The foam proportioner comprises a combined shell, an adjusting part, a flow guide part and a water flow agitating part, wherein the combined shell is provided with a mixing valve body, a first shell and a second shell, and the adjusting part, the flow guide part and the water flow agitating part are arranged on the mixing valve body; the first shell and the material mixing valve body form a first cavity, the second shell and the material mixing valve body form a second cavity, the flow guide piece is located in the second cavity, and the water outlet end of the flow guide piece is communicated with the second cavity; the first cavity and the second cavity are communicated through the water flow agitating part, and fire fighting water flowing into the second cavity from the first cavity is oscillated after being treated by the water flow agitating part, so that