The invention provides a signal receiver and a method for estimating residual Doppler frequency. The signal receiver comprises a code removal module, a carrier removal module, a Fast Fourier Transformation (FFT) module, and a signal processor. The code removal module removes a pseudo random noise code from a first signal to obtain a second signal. The carrier removal module generates a carrier signal with a frequency of an estimated carrier frequency, generates at least one delta carrier signal with a frequency of the carrier frequency plus a delta frequency, removes the carrier signal from the second signal to obtain a third signal, and removes the delta carrier signal from the second signal to obtain a fourth signal. The FFT module derives a series of first FFT values from the third signal, and derives a series of second FFT values from the fourth signal. The signal processor obtains the estimated carrier frequency of the second signal according to the first and second FFT values, to determine the estimated carrier frequency of the carrier removal module, and determines the delta frequency for the carrier removal module. The signal receiver reaches the effect of improving the frequency resolutions of FFT without increasing the filling time.