The invention relates to a decoding method and a device for LDPC code. Firstly, set default iteration times and maximum iteration times. After each iteration decoding, check if the verification equation cHT=0 is satisfied for output codeword c, the decoding can be successful and can be finished if the verification equation cHT=0 is satisfied, otherwise, if iteration times is more than or equal to default iteration times, decide if mean-variance of LLR (log-likelihood ratio) absolute value of code element in codeword c is more than default fixed threshold value. If satisfied, go on with the iteration decoding, otherwise, determine failure of decoding and finish decoding. If iteration times reach to default maximum iteration times, still determine failure of decoding. Compared with the prior art, the invention does not need to set different stopping criterion threshold according to different channel condition, and can promptly decide decoding state change to reduce large amount of calculation.