The invention discloses a double-shaft rotation optical fiber strapdown inertia navigation device which comprises a box body, a double-shaft rotation mechanism, an inertia-measuring unit and a circuit unit. A navigation computer sends control command to a rotation control circuit according to a planned rotation scheme. The rotation control circuit collects information of angle positions of an inner ring and an outer ring of the double-shaft rotation mechanism in real time according to the control command sent by the navigation computer, and calculates control quantity according to a control algorithm. The control quantity is transmitted to the inner ring and the outer ring of the double-shaft rotation mechanism through a power amplifier. The double-shaft rotation optical fiber strapdown inertia navigation device is capable of enabling the double-shaft rotation mechanism provided with the inertia-measuring unit to rotate according to the planned rotation scheme, achieving modulation of deviation between a fiber-optic gyroscope and a quartz beam vibration accelerator, greatly improving self-navigation accuracy of the inertia navigation system and solving the problem that accuracy of the self-navigation accuracy is poor when the inertia navigation system is in long navigation.