The present disclosure discloses a multimedia messaging service (MMS) decoding method, an MMS decoder and a mobile terminal. The method comprises the steps of: parsing an original MMS data packet, acquiring all the non-SMIL (synchronized multimedia integration language) files in it, and counting the number of all the non-SMIL files as the first non-SMIL file number; determining whether an SMIL file exists in the parsing result, if yes, pre-parsing the SMIL file, obtaining the number of the non-SMIL files described by the SMIL file, and counting the number as the second non-SMIL file number, comparing the first non-SMIL file number with the second non-SMIL file number to obtain the formal SMIL file to be parsed; integrally parsing the formal SMIL file to be parsed, obtaining the data structure describing the playing layout of MMS, and taking the data structure and all the non-SMIL files obtained in step A as the MMS decoding result. The present disclosure improves the MMS decoding effect and the user experience.