Mid-infrared fiber lasers have broad application prospects in military, atmospheric communication, medical and other fields owing to their special output wavelength and high beam quality. The latest progress of fluoride and chalcogenide mid-infrared fiber lasers is described from the perspective of different rare-earth doped ions. Meanwhile, our latest progress in mid-infrared fiber lasers is also introduced. Finally, the development trends of the mid-infrared fiber lasers are prospected.