As a cutting-edge technology, three-dimensional (3D) printing technology is currently widely used in many fields, and hydrogel as an emerging material is also more and more widely used. However, ordinary hydrogel has poor physical properties and relatively insufficient stability. The hydrogel based on 3D printing technology has been paid more and more attentions by researchers. 3D printing hydrogel combines the advantages of both 3D printing and hydrogel, and has excellent physical and chemical properties, such as high mechanical strength, excellent electrical conductivity. It has been made into many 3D complex structural scaffolds. Because the prepared complex structural scaffolds have good biocompatibility, biodegradability and other advantages, 3D printing hydrogel have been fully applied in the medical field. In this review, the preparation materials, physical and chemical properties, preparation methods of 3D printing hydrogel and its applications in the medical field are summarized systematically.

三维（3D）打印技术作为一项前沿技术，目前在诸多领域得到广泛应用，而水凝胶作为新兴材料的应用也越来越广泛。然而，普通水凝胶物理性能较差，稳定性相对不足。基于3D打印技术的水凝胶越来越受到研究人员的关注。3D打印水凝胶结合了3D打印和水凝胶的优点，具有优异的物理和化学性能，如机械强度高、导电性好等。它已被制成许多3D复杂结构的脚手架。由于制备的复合结构支架具有良好的生物相容性、生物降解性等优点，3D打印水凝胶在医学领域得到了充分的应用。在这次审查中，