The invention discloses an internal combustion engine work method and a nitride engine. Nitrides are adopted as fuel of the nitride engine. The nitride engine is composed of an explosion air cylinder, a pneumatic conversion mechanism, a nitride injection valve, a spark plug, a buffering piston, a buffering spring, a high-pressure gas output valve, a water inlet valve, a water pump, a water tank, a pneumatic conversion cylinder, a high-pressure gas inlet valve, an exhaust valve and a pneumatic piston. The internal combustion engine work method adopted in the nitride engine is a technical scheme adopting chemical energy in the engine field, the structure is simple, implementation is easy, and the beneficial effects that raw material resources are convenient to find, and the circulation regeneration cycle is short are achieved.