The invention provides a method for realizing IMS multimedia conference service charging, comprising the following steps: firstly, expanding an AVP structure which is used for expressing multimedia conference service charging information in a Diameter protocol charging information structure, wherein, the AVP structure comprises conference identification fields, conference fee accounts fields, charging role fields, charging type fields and conference flow type fields; and secondly, recording charging information of users by the CONF AS through the AVP structure in the process of the multimediaconference service and sending the AVP structure to the charging functional entity; carrying out charging ticket recording, associating and sorting by the charging functional entity according to the AVP structure, thus realizing charging. The invention not only solves the problem that the current multimedia conference service charging is different from the ordinary point-to-point communication charging, and content expansion is easy to realize according to the subsequent technical development.