The invention provides a sensitively heated liquid evaporation type micro-thruster and a preparation method thereof and belongs to the field of aviation, spaceflight, micro-propulsion technologies andmicromechanics. The micro-thruster comprises a cavity layer, an upper cover piece, a substrate, a metal heating plate, an upper PCB, a lower PCB, a magnet exciting coil I and a magnet exciting coil II, wherein the structures manufactured on the cavity layer include a micro-channel, a shrinkage opening, a heating evaporation cavity and a laval spray port. Specifically, electromagnetic induction heating liquid is utilized and is vaporized in a heating cavity, the pressure in the cavity is increased, high-pressure gas is sprayed out of a micro-spraying orifice to produce a thrust, and thus the micro-thruster obtains a driving force in the opposite direction. The micro-thruster plays the very important effect on position keeping, gesture control, gravitation compensation, track adjustment andthe like of a microsatellite.