The invention discloses a sequence conversion method and device. The sequence conversion method comprises the following steps of: receiving a source end sequence; converting the source end sequence into a source end vector expression sequence; obtaining at least two candidate target end sequences according to the source end vector expression sequence, and obtaining a translation probability valueof each candidate target end sequence in the at least to candidate target end sequences; adjusting the translation probability value of each candidate target end sequence; selecting to output a targetend sequence from the at least two candidate target end sequence according to the adjusted translation probability value of each candidate target end sequence; and outputting the output target end sequence. By using the method and device provided by the invention, loyalty indexes, to source end sequences, of target end sequences can be improved when sequence conversion is carried out.