The present invention discloses a master station smart power grid scheduling technology support system-based clock synchronization method, comprising the following steps of: S1, connecting a plurality of clock sources to a local area network, and setting priorities of the clock sources; S2, setting the clock source status monitoring service on a clock acquisition server, and updating the priorities of the clock sources in real time; S3, determining a main clock acquisition server and a standby clock acquisition server by using node management provided by a smart power grid scheduling technology support system, and acquiring clocks; S4, comparing the clock information of a local clock with acquired clock information of the clock source with the highest priority by the main clock acquisition server, and if a difference exists, synchronizing the local clock; and S5, exchanging a piece of clock synchronization message with another working node by the main clock acquisition server, and calculating and eliminating the time delay and updating the time of the another working node by the another working node. The method improves the time accuracy of the smart power grid scheduling technology support system, and ensures the consistency of the system clock.