Abstract: Water is necessary for organisms to survive in nature. In the animal and plant kingdoms, there are many interesting wetting phenomena. Recently, the research on the wettability of bio-inspired micro/nano-structured composites is an emerging and hot topic, which involves interdisciplinary and multidisciplinary subjects. This paper reviews the research progress of spider silk-like micro-composites with water collection for the field of bionic engineering. The micro/nano-structure and related mechanism for controlling wettability or liquid behaviours are briefly analysed. The fabricating and preparing methods of bio-inspired spider silk and integrated spider web are summarised, including dip-coating, electrospinning, micro-fluidics, 3D braiding, 3D printing, etc. The structure and fog harvesting ability of diverse micro/nano composites are displayed. This article also analyses and compares the bio-inspired structure design, fabricating and preparing technology, and water collection performance of diverse spider silk-like micro/nano composites. These composite materials which have water-harvesting function will have further or new applications in chips, weather forecast, seawater desalination, drug release, micro-reactor, energy storage and conversion, etc.