The invention provides an edition updating method and an edition updating device. The method comprises the following steps: dividing an updating edition document into N segments; distributing the N segments to at least two sets of multicast group addresses; confirming a multicast group address corresponding to the updating edition document of a to-be-updated AP; informing the to-be-updated AP to participate to the confirmed multicast group corresponding to the multicast group address; sending the confirmed segments corresponding to the multicast group address in the manner of multicast group; reconstructing the segments received from the confirmed multicast group address by the to-be-updated AP and then updating the edition document of the AP. According to the technical scheme provided by the invention, the updating edition document is sent in the multicast manner, the transmission volume of the updating edition document is reduced, AC processing performance is promoted, the network bandwidth is saved, the transmission efficiency of the updating edition document is increased and the edition updating time is saved.