The invention discloses a channel estimation device and an estimation method of the multi-carrier receiver. In the channel estimating device of the digital information receiver used for processing thedigital broadcasting signal which is inserted at least two or more similar and continuous synchronous signals, the channel estimating device of the multi-carrier receiver comprises: a correlative unit which is used to calculate the correlation according to the received digital broadcasting signal and the reference synchronous signal; a detection unit of the wave crest which is used to detect thecorresponding correlation position of the last synchronous signal in the calculated correlation; a window unit which is used to choose the correlation with predetermined interval from the correlationreceived by the autocorrelation unit, and the predetermined interval comprises the position detected in the detection unit of the wave crest; a channel estimating unit which is used for channel estimation according to the correlation chosen by the window unit. So the estimation device has an advantage of estimating channel exactly.