The embodiment of the invention provides a clock synchronization method and system, the clock synchronization system comprises a server, a base station and at least one industrial mobile device, an industrial gateway is integrated on the industrial mobile device, and the server is used for obtaining a reference clock and generating a synchronization message according to the reference clock, and sending the synchronization message to the base station; the base station is used for receiving the synchronization protocol message and sending the synchronization message to the corresponding industrial mobile device; the industrial mobile device is used for receiving a synchronization message sent by a base station through the industrial gateway, analyzing the synchronous message to obtain corresponding clock information, and performing clock synchronization according to the clock information. Clock synchronization between the industrial wireless devices is realized.