The invention is concerned with gas sand-gravel fire extinguishing system for forest and grassland with sand-gravel and dust. It relates to sand mining machine, sand transportation framework, vibration filtration framework, sand distributing framework, venturi tube, gas leading tube and air injection gas turbine. The sand mining machine is at the bottom of the whole equipment, while working, it connects with the earth and the spade blade mines sand and dust by deadweight or the power of spring. The sand transportation framework is in type of chain or spire, and its front part connects with leading shell to the mining machine, and its back part connects with vibration filtration framework. The two ends of venturi tube is expanding and the middle of it is contracted with some radial holes at the throat, its lumen connects with gas leading tube and outside cavity connects with sand distributing framework. This invention continues to work with well effect and high power.