The invention discloses a virtual machine migration method based on temperature. The method comprises a temperature monitoring step and a virtual machine migration step, wherein the temperature monitoring step is used for collecting the temperature of each physical machine and the resource use condition of the physical machines and a virtual machine in real time; the virtual machine migration step is used for judging whether the migration needs to be triggered or not according to the collected temperature and resource use condition information, when the migration is needed, the decision is made, in addition, a specific virtual machine to be migrated and a specific target physical machine are selected, and the migration is executed according to the mapping relationship between the specific virtual machine and the specific target physical machine. The invention also discloses a virtual machine migration system based on temperature.