Abstract: Studies the function of wavelet transform (WT) that can effectively distill the transient characteristics of digital signals to estimate the symbol rate of PSK signals. Through obtaining WT's coefficient of PSK signals, the phase changes between different symbols can be effectively extracted. By means of the autocorrelation operation of the WT's coefficient and other processes the symbol rate of PSK signals is then estimated accurately. The advantages of this method include no need of any prior knowledge of the modulated signals and accurate estimation even at low signal to noise ratio (SNR). Simulation in Matlab environment with BPSK,QPSK and 8PSK signals shows that the symbol rate estimation is accurate at SNR≥8 dB.