The invention belongs to the technical field of fiber-optic gyroscope temperature shift, and particularly relates to a polarization-preserving optical fiber capable of reducing fiber-optic gyroscope temperature drift. The polarization-preserving optical fiber sequentially comprises a fiber core, a stress area, a wrapping layer, an inner coating layer and an outer coating layer from inside to outside, the fiber core is made of quartz materials doped with germanium ions and boron ions. The polarization-preserving optical fiber solves the technical problem of high fiber-optic gyroscope temperature drive in the prior art; by an ion doping technology, refractive index temperature change coefficient of the fiber core is decreased, Shupe phase error caused by temperature is suppressed, and gyroscope temperature is increased.