The invention discloses a micro heat exchanger having a distributed ports structure. The micro heat exchanger comprises a channel chip of cool and heat fluid, a heat transferring board having a fluid channel hole and a metallic blanking plate having a fluid channel. The fluid chips have same structure and size; the channel structures of two fluid chips are symmetrical; the fluid channel hole on asecond fluid chip is arranged on an opposite angles area of a first fluid chip; and the port area on the fluid channel of each chip is a multi-channel structure and forms a distributed inlet and outlet together with the adjacent heat transferring board and the channel hole on the chip. The heat exchanger of the invention has the advantages of high-transfer character of the micro-channel heat exchanger, has the property of rapidly scattering fluid media into fine fluid units, is applied to integrating on a large-scale reactor unit and is particularly fit for heat exchange of high steam pressure fluid.