Data synchronization method, system and device of multi-redundancy system and medium

The invention relates to a data synchronization method, system and device of a multiple multi-module redundancy system and a medium, and the method comprises the steps: firstly, obtaining voted data determined by each main control CPU in a main control module through a redundant synchronization channel; screening voted data transmitted by each master control module according to a preset validity criterion; each redundant CPU attaching a validity mark to the screened voting data, and forwarding the voting data to other CPUs in the same redundant module through the data forwarding channel; each redundant CPU performing data synchronization according to the received voted data conforming to the preset validity criterion and/or the voted data forwarded by other redundant CPUs; wherein the operation cycle of the main control module and the operation cycle of the redundancy module are synchronous. According to the invention, the data synchronization in the redundant system under the normal condition can be ensured,