Disaster recovery method and device of cloud host and medium

The invention discloses a disaster recovery method and device of a cloud host and a medium, and is suitable for the field of network security. Comprising the following steps: acquiring cloud host resources of a production site; configuring each cloud host resource to generate a corresponding disaster recovery task; distributing each disaster recovery task to a corresponding physical host according to a load balancing algorithm so as to start the corresponding disaster recovery task; and writing the difference data corresponding to the started disaster recovery task into the disaster recovery station to complete the disaster recovery process of the cloud host. According to the method, the disaster recovery tasks are allocated to the corresponding physical hosts through the load balancing algorithm, so that the operation of the disaster recovery tasks is not limited by a certain specific physical host, the physical hosts for operating the tasks are flexibly selected, computing resources of the physical hosts in