A microwave optical fiber laser device according to an embodiment of the present invention includes: a pump light source for generating near-infrared light; An infrared gain medium optical fiber forming a section of a closed loop type laser resonator connected to a pump light source and emitting near infrared rays and emitting a middle infrared ray; And a passive locking module mounted in the path of the laser resonator and converting the wavelength of the medium infrared into microwaves. According to the embodiment of the present invention, it is possible to produce microwaves of medium-infrared light, and it is made of an optical fiber-based optical system that is not a bulk optical system, so that it can have excellent durability against external impacts.
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