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An intelligent turbine flow detection system based on two-circle coaxial fiber was presented in this paper. For a start, the two-circle coaxial fiber optic sensor was used for picking up signal, the next, the hardware circuit was for signal preprocessing, once mare, the TMS320F2812 DSP chip was used for further signal processing by software, finally, the flow signals can be obtained. The structure of two-circle coaxial fiber adopted can eliminate interference factors, while the DSP can perform high-speed signal acquisition and processing with algorithms, which supplied an important basis for the prototype manufacturing. The system can be applied to liquid flow measurement in industrial production, scientific research and aerospace power plant fuel control, which is better than the traditional electromagnetic turbine flow mater in terms of functionality and maintainability.