Coherent light sources in the mid-infrared (mid-IR) range have broad practical and potential applications in spectroscopy, remote sensing, medical and military. Erbium(Er)-doped ZBLAN fiber lasers are well suitable for mid-infrared coherent light source at 2.7 μm. The latest progress of watt-level continuous wave (CW), high-power pulsed, wavelength-tunable, Q-switched and CW mode-locked Er3 +∶ZBLAN fiber lasers operating at 2.7 μm is introduced in this article. Finally, the development trends of the mid-infrared Er-doped ZBLAN fiber lasers are prospected.