The invention provides a novel two-stage light-gas gun driven by high pressure air and belongs to the technical field of light-gas gun experiments. The novel two-stage light-gas gun mainly comprises asupport, a first-stage air chamber, a first-stage air chamber electromagnetic valve, a trigger electromagnetic ball valve, a second-stage air chamber, a large piston, a small piston, a launching pipe, an air release device and the like. A two-stage air chamber power source is adopted, the second-stage air chamber is divided into a large piston section and a small piston section, the two inside pistons are in rigid linkage, in the initial state, the first-stage air chamber and the small piston section of the second-stage air chamber are filled with high pressure air, storage and release of thehigh pressure air are controlled by the electromagnetic valve, and thus under the circumstance that initiating explosive devices, hydrogen and other flammable and explosive gases cannot be provided,superspeed flying of an object is achieved through air compression loading. The novel two-stage light-gas gun is safe and reliable, superspeed flying of the object is achieved with a compressed air method, experiment cost is low, and operation is safe, simple and convenient.