A FFT-based blind channel searching and estimation method, comprising the steps of waiting for a power-on signal from a DVB-S receiver, judging whether a complex of automatic gain control signals of the receiver have converged, producing a complex of data samples by utilizing the FFT, calculating energy after the FFT and accumulating the energy to be saved to the memory of the DVB-S receiver, detecting whether sample times exceed a predetermined value, filtering a complex of signal noises after accumulation with a filter, judging whether a channel of the channel has been searched, finishing searching and calculating to produce a symbol speed and a center frequency shift, and enabling a decoder action. The present invention is applied for a DVB-S receiver to effectively decrease the time required to complete a blind search and guarantees that an exact signal in a DVB-S receiver is found.