Node searching and positioning system in internet of thing

The invention discloses a node searching and positioning system in the internet of thing, belonging to the communication field. The system comprises a plurality of first nodes and a first-level server, wherein the first nodes are used for judging whether self code is same with known code when receiving a request message which is from other first nodes and carries searched node known code; if yes,the current first node serves as a search node, and a search replay message containing the position message of the current first node is returned back to the first node which initiates search in the request message; if no, the position information of the current first node is written into the request message, and the current written request message is broadcast to the adjacent node of the first node; the first-level server is used for receiving a request message which is uploaded by the first node and carries the searched node known code when the first node is connected with the first-level server.