Clock synchronization method and system based on trusted execution environment

The invention provides a clock synchronization method and system based on a trusted execution environment, and relates to the technical field of industrial internet, and the method comprises the following steps: a trusted equipment end timing step: migrating a clock source driving program of an equipment end into the trusted execution environment, and realizing trusted clock service in the trusted execution environment, obtaining the trusted time by adding the clock source reading and a trusted clock deviation value maintained by the trusted clock service; a device end clock data and cloud synchronization step: enabling the device to periodically or actively synchronize clock data of a cloud clock source; and a step in which the device persists clock data with a randomized period: storing the trusted clock data in the randomized period, and therefore, the influence of power failure of the equipment on timing is reduced under the condition that the influence on the performance of the equipment is small. Accord