The invention discloses a virtual machine fault rapid recovery method and system. A virtual machine address mapping table is backed up, a host machine physical page corresponding to the virtual machine is set to be read-only, protection of host machine physical memory content corresponding to the virtual machine is achieved through the write-time copying technology, and after the virtual machine breaks down, the previous backup state of the virtual machine can be rapidly recovered. The method has the advantages of being small in backup data size, high in backup and recovery speed and the like,and reliable operation of the virtual machine is guaranteed.