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Functional nano-coatings have been a research hotspot in recent years. The nano-size composition units provide good volume effect and surface effect for functional nano-coatings, and greatly optimize the mechanical properties, corrosion resistance, oxidation resistance and wear resistance of the coatings. The preparation technology and properties of functional nano-coatings determine the application range of nano-coatings. However, most reviews focus on certain properties, preparation methods or applications of functional nano-coatings, and lack of reviews on the integrity of functional nano-coatings. Firstly, this work introduced the concept and classification of functional nano-coatings briefly. Secondly, the preparation techniques of functional nano-coatings were described in detail, including traditional chemical vapor deposition, physical vapor deposition and sol-gel method, the latest plasma spraying technology and other preparation techniques. Moreover, the principles, advantages and disadvantages of various nano-coatings preparation technologies and the application of nano-coatings in materials were analyzed and summarized. Finally, the latest and popular applications of functional nano-coatings were reviewed in detail, and the application prospect and potential of functional nano-coatings were prospected.