Clock board clock protection switching method and device

The invention discloses a clock board clock protection switching method and device, and relates to the technical field of electronic communication. The clock board clock protection switching method comprises the steps that a main clock board generates a reference clock used for system clock detection; the main clock board carries out frequency detection on a system clock which is provided by the main clock board for each service single board by using the reference clock; and the main clock board notifies each service single board to carry out main-standby clock board switching when detecting that frequency deviation of the system clock exceeds a set value so as to use a system clock provided by a standby clock board. The method disclosed by the invention reduces influences brought about by clock board crystal oscillation or crystal aging and damages, and improves the reliability of system clock board clock protection switching. 本发明公开了种时钟板时钟保护倒换的方法及装置，涉及电子通信技术领域，其方法包括以下步骤：主用时钟板生成用于系统时钟检测的参考时钟；主用时钟板利用所述参考时钟对主用时