The invention provides an air suction type solar heat micro thruster. The air suction type solar heat micro thruster mainly comprises a main body, an air intake channel, a diffuser pipe, a light collecting system, a heat exchange structure and a spraying pipe. The air suction type solar heat micro thruster has the advantages that the air suction type solar heat micro thruster can be applied to an ultra-low orbit satellite in an atmospheric layer which is 120-300km away from ground, air entering the micro thrust is heated by collected solar energy to obtain high-temperature air, the high-temperature air is sprayed out by the spraying pipe to produce about 0.02-2N thrust, and the thrust is very suitable for the attitude adjusting and drag compensation of the satellite; because a working medium of the micro thruster is mainly thin air, and the solar energy is used for heating, an aircraft only carries a small amount of propellant, thus the weight of the thruster is reduced, the maneuverability of an orbit is improved, the effective load of the aircraft is increased, and the on-orbit time of the aircraft is prolonged; by supplementing the propellant, the thrust produced by a thrusting system is increased, and the space application range of the aircraft is expanded.