The invention discloses a sand-blasting fire extinguisher provided with a high-pressure air tank. The sand-blasting fire extinguisher comprises a fire extinguisher main body, the high-pressure air tank, an air valve, an air valve rod, a sand grain chamber, a sand outlet, a fire extinguishing pipe, a valve, a valve pull ring, an air valve pressing rod, an air valve pressing rod supporting rod, a handle and an air guide pipe, wherein the high-pressure air tank is arranged at the bottom of the fire extinguisher main body; the air valve is arranged at the upper part of the high-pressure air tank; the air valve rod is mounted on the air valve; the sand grain chamber is arranged at the upper part of the fire extinguisher main body; the sand outlet is formed in the top of the sand grain chamber; the air guide pipe is arranged between the high-pressure air tank and the sand grain chamber and is connected with the air valve; the fire extinguishing pipe is connected with the air guide pipe. The sand-blasting fire extinguisher disclosed by the invention can be applied to a conflagration area which is unsuitable for being extinguished by water, and is capable of ejecting sand grains to an area which requires fire extinguishment.