The invention relates to a deblurring computation amount reducing method for satellite navigation XFAST capturing. The method is characterized in that: after obtaining the result of coarse acquisition alignment code phase is obtained by using Extended Replica Folding Acquisition Search Technique (XFAST), firstly conducting rearrangement, segment, inter-segment cycle shift on unfolded local code sequences according to an alignment code phase, then conducting inter-segment folding, implementing cycle-related operation by means of FFT-IFFT operation in combination with receiving codes so as to determine sub-code segments where the alignment code phase is at, and obtaining the result of deblurring acquisition by performing computation. According to the invention, the method is advantaged that the method can greatly reduce the computation amount of deblurring and increase acquisition speed with the number of local folded segments and sub-segment length meet certain conditions and the precise acquisition detection property is not lowered.