In order to meet the application requirements of the general inertial navigation system of precision guidance weapon, an inertial navigation signal processing system based on ARM embedded platform is designed, which realizes the synchronous acquisition and real-time processing of the signals of fiber optic gyroscope and quartz accelerometer sensor. In the paper, the system scheme is designed, the function is divided and realized. The experimental results show that the AD conversion circuit of accelerometer signal not only effectively solves the contradiction between the input range and performance index of the Current-Frequency conversion circuit, but also is simple in design and easy to realize. The system meets the design requirements, and has the characteristics of miniaturization, low cost and strong versatility.