The invention provides a charging method, device and system of an IP call center, wherein the IP call center charging method applied to interconnection border control function entity IBCF side comprises the steps of: obtaining calling information of a calling user in a conversation; according to the calling information of the calling user, determining a charging type of the conversation; and writing the charging type of the conversation into call bill information of the IBCF so as to enable a charging system to determine whether to charge the IP call center for long-distance cost according to the call bill information of the IBCF. Under the condition that the IP call center is directly connected with an IMS network through the IBCF, the IBCF carries out charging type adjustment respectively according to different calling access scenes and records the charging types in the call bill information of the IBCF, so that the charging system is enabled to charge the IP call center according the charging types in the IBCF call bill. According to the invention, the charging method is consistent with an existing charging rule and realized precise charging applied to the call center according to network resource usage conditions; in addition, the charging method, device and system are applicable to both CS users and IMS users, and the application range is wide.