The invention discloses an eccentric polarization maintaining optical fiber sensor and an OTC imaging device thereof. The eccentric polarization maintaining optical fiber sensor comprises a detection arm, a first anti-reflection lens, an optical path adjusting lens, and an optical delay time. The detection arm uses an eccentric polarization maintaining optical fiber as detection arm optical fibers. The eccentric polarization maintaining optical fiber sensor also comprises a balance receiver, a second anti-reflection lens, a reference reflector, and a polarization controller. The eccentric polarization maintaining optical fiber is used to make a sensor suitable for biological tissue detection, and the sensor is used in an OCT imaging system, optical signal strength is enhanced, and image quality is improved.