The present invention relates to a mobile jamming attack method applied in a wireless sensor network (WSN) and method defending the same. The mobile jamming attack method is a power exhaustion denial-of-service attack, possesses mobility and self-learning capability and is unable to be defended with existing defending scheme due to its attack to the routing layer of the WSN; the mobile jamming defending method employs multi-topologies scheme to defend the mobile jamming attack so that the affected area is reduced, the base station can still receive reply packets under the attack, and the jammed area can be roughly located and the track of the mobile jammer can be traced.