The invention discloses a parallel decoding method and device in a multi-core processor, belonging to communication field. The method comprises that a first core of the multi-core processor receives slice code flow comprising m rows of macroblocks, wherein m is a natural number larger than 2; entropy decoding is performed to the slice to obtain macroblock information comprising macroblock mode, motion vector and residual macroblock; the 2nd to the jth core of the multi-core processor performs interframe mode decoding on the m rows of macroblocks according to the macroblock information; after finishing the interframe mode decoding, intraframe mode decoding is performed according to the macroblock information; when the number of the decoded macroblocks equals to the number of the macroblocksof the slice, the slice being performed decoding process is obtained; the slice is performed loop filter to obtain the slice being performed loop filter. The technical scheme can keep loading balance, which is beneficial to improving resource utilization rate.