Clock synchronization and fault feedback method and device

The invention provides a clock synchronization and fault feedback method, which comprises the following steps: after a slave clock receives a first message sent by a first master clock, calculating to obtain a first local clock correction value needing to be corrected by a local clock and a first maximum correction value needing to be corrected by the slave clock; after the slave clock receives a second message sent by the second master clock, calculating to obtain a second local clock correction value needing to be corrected by the local clock and a second maximum correction value needing to be corrected by the slave clock; the first local clock correction value is compared with the first maximum correction value, the second local clock correction value is compared with the second maximum correction value, and a fault identification result and a clock synchronization result of the slave clock are determined based on clock synchronization and fault identification criteria. According to the invention, whether the message sent by the master clock device is lost or has a wrong value is detected, and clock synchronization and fault positioning of the slave clock can be completed; in addition, a double-master-clock structure is adopted, so that the problem of transient failure of a single master clock is solved.