Virtual machine migration method and device and storage medium

The invention belongs to the technical field of computers, and discloses a virtual machine migration method and device and a storage medium. The method comprises the following steps: reading dirty page bitmap information from a bitmap storage space, and determining a to-be-sent dirty page according to the dirty page bitmap information; under the condition that the dirty page to be sent and the preset pause duration meet the final iteration condition, pausing the source virtual machine, and reading the dirty page bit mark in the last-stage page table; updating the dirty page bitmap information according to the dirty page bit mark to obtain current bitmap information; and determining a current dirty page to be sent according to the current bitmap information, and sending the current dirty page to be sent to the target migration device. In the migration process of the virtual machine, dirty page tracking is carried out by utilizing the dirty page bitmap information instead of utilizing an existing mode, so that