Provided are a method for forming a centralised AP cluster and an access point, which relate to the field of communications and can solve the problem of OBSS interference between an AP and a neighbouring AP on the same channel when the AP cannot receive a beacon frame of an S-AP and thus cannot join an AP/PCP cluster. The method comprises: a first access point (AP) receiving a first beacon frame sent by a second AP, wherein the first beacon frame contains chained cluster information and a first available cluster time offset bitmap field, and the chained cluster information is used for indicating the first AP to join a first AP cluster of the second AP in the role of a virtual S-AP; after the first AP joins the first AP cluster of the second AP, the first AP updating the first available cluster time offset bitmap field to be a second available cluster time offset bitmap field; the first AP sending a second beacon frame in a first beacon service period of a second AP cluster, so as to enable a third AP that receives the second beacon frame to join the second AP cluster established by the first AP as a second virtual S-AP. The embodiments of the present invention are applied to the forming of an AP/PCP cluster.