In this study, we propose a turbulent flow-velocity measurement system based on the optical fiber Fabry-Perot (F-P) sensing technology, which can be used to monitor the high-speed airflow velocity at hydrojunctions. The proposed system comprises an airflow sensor holder and a polarized low-coherence interferometry demodulation section. The flow-velocity is calculated using two F-P sensors, which can be used to measure the pressure and temperature variation of the airflow field. Further, the interference signal obtained using a low-cost linear CCD can be accurately demodulated by tracing the peak position of a single fringe pattern and using the seven-step phase shifting method. The two F-P sensors are calibrated in the temperature range of 20-40 ℃ and the pressure range of 98-110 kPa. The pressure absolute error of the sensor used to measure the stagnation pressure is less than 0.018 kPa, while that with respect to the temperature of the sensor used to measure the airflow field temperature is less than 0.08 ℃. The proposed system is used to measure the airflow velocities ranging from 9.3 to 93 m/s, and the absolute error of the flow-velocity is less than 0.49 m/s. The experimental results indicate that the proposed system can be employed to measure the flow-velocity of high-speed turbulence with a low cost and possesses a wide application prospect.