Low-cost solid rocket engine

The invention provides a low-cost solid rocket engine, and relates to the technical field of solid rocket engines, the solid rocket engine comprises a heat insulation front sealing head, an ignition device, a charging combustion chamber and a spray pipe; the heat insulation front end socket, the ignition device, the charging combustion chamber and the spray pipe are sequentially arranged from left to right along the axis of the engine. An engine accommodating cavity in the engine is formed in the heat insulation front sealing head, the charging combustion chamber and the spray pipe; the ignition device receives an ignition instruction, a propellant in the charging combustion chamber is ignited, high-temperature and high-pressure fuel gas generated in the charging combustion chamber expands and accelerates through the spray pipe, chemical energy is converted into kinetic energy, and the fuel gas expands and accelerates acting through the spray pipe to generate thrust. Performance and cost of the rocket engine