Since the measuring signal obtained from Brillouin distributed sensing system, which is disturbed by the external environment, degrades the measuring accuracy in field applications, a wavelet signal processing method is used to denoise the measured signal based on Brillouin distributed optical fiber sensing technology, and verified by the measured strain data of a smart cable based on the Brillouin sensing technology. The results of wavelet denoising method shows that this method can effectively denoise measured strain of the smart cable polluted by noise, and improve the measuring accuracy of cable force. The maximum relative errors between the control cable force and the whole average cable force before and after noise filtering are 8.8% and 5.1%, respectively, which hints that the wavelet denosing method is suitable for the measured signal obtained from the Brillouin optical sensing system.