The invention relates to a receiver of an OFDM system and a moving speed estimation method thereof, belonging to the field of wireless communication. The method comprises the following steps: 1) leading the receiver to convert a time domain OFDM signal r(n) to a frequency domain OFDM signal R(n); 2) leading the receiver to carry out channel estimation on the frequency domain OFDM signal R(n) and obtaining frequency domain channel response Hi of each OFDM symbol; 3) leading the receiver to calculate the change value delta H of the frequency domain channel response between the different OFDM symbols according to the obtained frequency domain channel response; and 4) leading the receiver to estimate the current moving speed of the receiver according to the change value delta H; and the system comprises a fast Fourier transform module, a channel estimation module, a frequency domain channel response change estimation module and a moving speed estimation module of the receiver. The moving speed estimation method of the receiver is simple, rapid and easy to implement and is not only applicable to Rayleigh channels, but also applicable to Rician channels; furthermore, the estimation precision is high.