The invention provides a miniature free piston power generator based on combustor annular arrangement. The miniature free piston power generator comprises a stator and a miniature free piston power device, and fixed dividing rings are arranged in a stator working unit; the miniature free piston power device is installed inside the stator working unit, a working chamber comprises a combustor, and the combustor is internally provided with a combustor air inlet and a combustor air outlet; the distance between the center of the combustor air inlet and a combustor inner rib plate is larger than the distance between the combustor air outlet and the combustor inner rib plate; a one-way valve is arranged at the combustor air inlet, an outer ring stator wall is provided with an exciting winding, the outer ring stator wall and an inner ring stator wall are both provided with stator windings, and the exciting winding is connected with an external power source; and the stator windings are connected with an energy storage battery. By means of the miniature free piston power generator, piston motion mechanical energy is directly converted into electric energy, exhaust gas kinetic energy is used for driving a turbine motor and a gas compressor to work, mixed gas is pressurized, the initial pressure of the mixed gas is increased, and the compression ratio is increased.