The invention discloses an Ad Hoc network method and device. A networking server is connected to the network, and routing list information is initialized; network-in information from new Ad Hoc network nodes or network-off information from original Ad Hoc network nodes is received, the routing list information is updated according to the network-in/network-off information, and the updated routing list information is sent to nodes of the present Ad Hoc network; and according to the nodes of the Ad Hoc network and communication time of the networking server, a communication path of the nodes of the Ad Hoc network is determined, and networking is completed. In the above process, the networking server is updated and maintained and issues a routing list of the Ad Hoc network to the nodes in real time, terminals of the nodes of the Ad Hoc network need not to broadcast the routing list information periodically, and the bandwidth resources is saved effectively; and the communication path among the nodes of the Ad Hoc network is optimized, so that the communication efficiency is improved, and communication requirements for the Ad Hoc network by Internet of Things are further met.