The invention discloses an SOAP (simple object access protocol)-based multicast application method. The method comprises the following steps: aiming at the existing SOAP, not changing the packaging format of the SOAP, judging similarity on SOAP request information from a client, extracting the information meeting the similarity condition of the SOAP request, forming new SOAP response information mixing the information of multiple users according to a defined data collecting template, then subpackaging the information according to a designed splitting algorithm of collected information by a middle router, and sending different information to different clients respectively. With the method, a large amount of information is collected together according to the method of similarity, and the situation that the SOAP information is sent out immediately once being generated is avoided. Compared with a traditional SOAP unicast protocol, by adopting a network with a multicast SOAP mechanism, the time delay and the protocol cost of a server and middle nodes can be improved, and the network performance can be improved.