Multicast query method in roaming environment

The invention discloses a multicast query method in a roaming environment. The method comprises the steps that access point equipment and CPE equipment carry out equipment authentication according to own equipment information; judging whether the access point equipment and the CPE equipment are successfully authenticated or not, and giving a response according to a result; sending a query request in the partition to obtain a query result; sending a query result in the partition to a multicast management server; detecting wireless connection or network port connection of the CPE equipment; and comparing the information reported by the CPE and received by the multicast management server with the original information to obtain a comparison result. According to the invention, by establishing a partition query mode, multicast query messages are effectively placed in the same area, the use of the query messages sent by a querier on a wireless network is reduced, and the wireless transmission rate of an air interfac