A method for verifying upgrade of diagnosis connector of diagnostic equipment is used to solve a problem that an illegal person implements an illegal upgrade for the diagnosis connector of the diagnostic equipment by cloning. The method comprises: obtaining upgrade file data sent by an upper computer of the diagnostic equipment, the upgrade file data comprises a connector upgrade file and signature information, the signature information is generated previously according to unique identification information of a designated connector and the connector upgrade file, the designated connector is the diagnosis connector corresponding to a requester that requests a server to provide the connector upgrade file; performing signature verification for the signature information in the upgrade file data according to the unique identification information of the diagnosis connector to be upgraded and the connector upgrade file; if the signature verification is passed, upgrading the diagnosis connector to be upgraded according to the connector upgrade file; and if the signature verification is not passed, refusing to use the connector upgrade file to upgrade the diagnosis connector to be upgraded.