1. An isolation method for a management virtual machine, comprising: acquiring a guest identifier; searching, according to the guest identifier, the management virtual machine for a kernel virtual machine corresponding to the guest identifier; creating the kernel virtual machine in the management virtual machine when the kernel virtual machine is not found in the management virtual machine; dividing a service provided for a guest virtual machine by the kernel virtual machine into multiple service components, wherein the guest virtual machine is a virtual machine corresponding to the guest identifier; and running the multiple service components in execution environments corresponding to permission of the service components, wherein the kernel virtual machine comprises the multiple execution environments, and wherein the multiple execution environments have different permissions.