Knapsack-type efficient fire extinguishing device

The utility model discloses a knapsack-type efficient fire extinguishing device which comprises fire extinguishing agent bottles, a bottle body fixing device and straps, wherein the bottle body fixing device is used for fixing the two fire extinguishing agent bottles, the straps are connected with the extinguishing agent bottles and the bottle body fixing device, a bottleneck of each fire extinguishing agent bottle is provided with a relief valve, the relief valve is provided with a pressure gauge and a startup valve, and a pressure-withstanding hose is connected with the fire extinguishing agent bottles and a spray gun through a T-way connecting component, and is movably provided with an extended injection pipe. After the device is carried on the back of a worker to a fire scene, the startup valves of the fire extinguishing agent bottles are started, and then fire extinguishing agents are sprayed out of the spray gun to carry out fire extinguishing, or after one or more extended injection pipes are adopted f