The invention relates to a power generation system which comprises a plurality of pressure resistant sealing vessels, atomization devices, a steam drum and a plurality of cylinders, wherein the pressure resistant sealing vessels are arranged above or in a heat source; the atomization devices are used for quantitatively spraying water fog in the corresponding sealing vessels; high-pressure steam is instantly produced by the water fog under the action of the heat source; the steam drum communicates with the sealing vessels and is used for storing the high-pressure steam from each sealing vessel; a plurality of cylinders are connected with the steam drum; and high-pressure steam output by the steam drum can drive a piston in each cylinder to continuously do work. According to the power generation system, when a steam engine works, a plurality of high-temperature sealing vessels are utilized to vaporize the injected water fog into the high-pressure steam, and the high-pressure steam drives the piston in each cylinder to continuously do work; the production mode of the high-pressure steam has the advantages of rapidness in speed, high thermal efficiency, controllable quantity of the high-pressure steam and the like; and during working, if the temperatures of the sealing vessels are enough high, the output power of each piston can be controlled by controlling the injection quantity of the water fog.