The invention relates to a liquid injection type super smooth surface and a laser precision micro-fabrication method thereof, and belongs to the technical field of functional materials. The liquid injection type super smooth surface takes a metal as a substrate; firstly, a micro-nano composite structure is prepared on the metal surface by means of laser etching; after that, a super-hydrophobic surface is obtained by baking, and then injected liquid covers the super-hydrophobic surface to obtain the liquid injection type super smooth surface. Test droplets include water droplets, acid solutions, alkali solutions, lake water, sea water, serum, glycerin and ketchup. The liquid injection type super smooth surface provided by the invention has very small frictional resistance, and can very easily slide off the surface and reduce the retention time and probability of the water droplets and other test liquid on the surface. The laser precision micro-fabrication method of the liquid injection type super smooth surface provided by the invention adopts the laser precision machining technology to prepare the micro-nano composite structure on the metal surface, the technological process is simple and easy to operate, no other chemical additives are needed, and there is no toxic side effect and pollution, so that the laser precision micro-fabrication method is suitable for large-scale and mass production.