The present invention relates to an active micro cooler comprising: an evaporator which, directly attached to a heat source, vaporizes refrigerant; a compressor which inhales and compresses vaporized refrigerant gas; a condenser which condenses compressed refrigerant gas for condensed refrigerant to release heat; a conduit which directs condensed refrigerant to the evaporator; and a expansion valve which, mounted on the conduit, expands condensed refrigerant. The evaporator and the condenser each comprises a heat transfer enhancement device which is mounted on a plate element having walls on the circumference of the element and several channel connectors for transmitting refrigerant. The active micro cooler according to the present invention has a comparatively simple structure and has a greater cooling capacity than a hand cooler.