Fuente: Wipo "IOT" The invention discloses an IOT device management method and device based on a block chain. The method comprises the steps that an IOT equipment manufacturer obtains request information of a user for applying for IOT equipment, wherein the request information comprises data information of the user; key request information is sent to a cloud service provider, wherein the secret key request information comprises data information of a user and identification information of an IOT device applied by the user, after receiving the secret key information sent by a cloud service provider, the secret keyinformation is issued to the IOT device, and a public key state in an IOT device management contract in the block chain is set as an activated state. The survival state and the operation time of theIOT equipment are managed through an IOT equipment management contract in the block chain; an IOT equipment manufacturer can obtain the survival state of the IOT equipment at any time, the managementefficiency of the IOT equipment is improved, the public key state of the IOT equipment is prevented from being tampered, and the communication security of the IOT equipment is improved.