The fiber lasers operating at 1.7 μm band have important applications in many fields, such as biological imaging, gas detection, material processing, and generation of mid-infrared laser. Thus, it has received extensive attention in recent years. In this paper, the progress of 1.7 μm fiber laser is reviewed in detail, and the characteristics of different technical schemes are discussed comprehensively, including fiber gas Raman lasers based on hollow-core fibers. Combined with application requirements, the development trend of fiber lasers in the 1.7 μm band is briefly prospected.