Switch upgrading method and device

The invention provides a switch upgrading method and device. The switch upgrading method comprises the following steps: receiving an upgrading request; when the upgrading request is a safe upgrading request, generating a private key and a public key based on the safe upgrading request; encrypting a switch original mirror image based on the private key to generate a switch mirror image installation package; and installing the switch mirror image installation package based on the public key. The switch upgrading method and device have two switch upgrading schemes of safe upgrading and conventional upgrading, and a user can flexibly adjust the upgrading mode according to actual requirements; the security upgrade ensures the legality and security of the switch startup mirror image, so that a switch file system is prevented from being attacked and hijacked by hackers, and the normal operation of switch equipment is ensured; according to the security upgrade, lossless upgrade of the mirror image file of the switch