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A new pitch detection of noisy speech signal for lower SNR is proposed in this paper. This method is a novel algorithm of Reverse CAMDF Autocorrelation Function (RCAF) pitch extraction from noisy speech based on searching and tentative smooth measure. The algorithm can estimate noise during speech presence, which employs the method of expanded spectral subtraction based on the noise compensation structure. A number of experiments show that by the RCAF method, higher efficiency and better detection accuracy can be obtained while the SNR is equal to -10 dB. However, such performance cannot be achieved by traditional methods, AMDF, CAMDF and AWAC with the same SNR.