The invention discloses a low-noise dual-polarization interference optic fiber gyroscope belonging to the technical field of communication. The optic fiber gyroscope comprises a light source, two linear polarized light generating circuits, two circulators, a polarizing beam splitter/combiner, a 3 multiplied by 3 polarization-preserving coupler, two photoelectric detectors, a phase modulator and apolarization-preserving optical fiber ring, wherein the light source is connected with input ends of the two linear polarized light generating circuits through optical fiber; two output ends of the two linear polarized light generating circuits are respectively connected with the optical fiber of two ports at one side of the polarizing beam splitter/combiner through the circulator; the port at the other side of the polarizing beam splitter/combiner is connected with the polarization-preserving optical fiber ring through the 3 multiplied by 3 polarization-preserving coupler; and the polarization-preserving optical fiber ring and the polarization-preserving coupler are connected with the phase modulator through optical fiber. Compared with the prior art, the optic fiber gyroscope realizes the inhibition of noise sensitivity by using the symmetry of the 3 multiplied by 3 polarization-preserving coupler and meanwhile is characterized by simple structure, low cost, small volume, high sensitivity and wide application range.