The present invention provides a clean room micro slope terrace and a construction method thereof. In the large-area clean room terrace construction, a mode of drainage of a micro slope below 0.5% isemployed, prior to pouring of a terrace concrete leveling blanket, a concrete leveling blanket pouring surface is divided according to drainage exposure blocking; implanting a plurality of full-wire screws along each drainage slope intersecting line on a building structure layer by employing an adhesion agent, employing angle iron to make a location slope skeleton and an exposure floor drain alongan embedded steel bar screw, and employing an angle iron skeleton and the embedded steel bar screw to cooperate with double nuts to control the drainage slope; and integrally pouring the concrete leveling blanket, taking the angle iron skeleton as a reference for leveling of each drainage slop and each flatness, performing light collection, maintenance and forming, and performing finish coat construction after polishing. The structure is simple, the operation is convenient, the construction cost is saved while the clean room construction cleanness quality is improved and the construction efficiency is accelerated, it is convenient to achieve construction and organization, the integration benefit is very obvious, and therefore the clean room micro slope terrace and the construction methodthereof provide great convenience for the clean room terrace construction.