▎ 摘　　要

Graphene oxide (GO) is a popular two-dimensional material with excellent mechanical properties, good water dispersibility, non-toxicity, and good biocompatibility, and its surface has a large number of oxygen-containing functional groups. Therefore, GO is an ideal hydrogel raw material. Hydrogel is a multi-element system with a three-dimensional network structure and water as the filling medium. The introduction of GO into the hydrogel system can improve the mechanical properties of the hydrogel and enrich its stimulus response types. At present, GO hydrogel has excellent performance in many fields such as high strength, adsorption, self-healing materials and sensors, and has become one of the research hotspots. The research of GO hydrogel has a history of ten years. In this review, the preparation methods of GO hydrogels are summarized, including acidification and the addition of polymers, small organic molecules or ions as crosslinking agents. Among them, GO/polymer composite hydrogels prepared by physical mixing and chemical crosslinking and polymerization methods are the most common. The response mechanism and research progress of smart GO hydrogels are summarized in terms of photo-thermal response, pH response and self-healing. The application prospects of GO hydrogels in high strength hydrogels, biomedicine science, smart materials and sewage treatment are reviewed.