The invention discloses an operation-maintenance automatic inspection method for fine granularity control and a system thereof. The method comprises the following steps: S1, building a unified daily inspection knowledge base; S2, according to a business scene, generating an inspection task; S3, performing the scheduling execution to the inspection task in the step S2; and S4, generating an inspection report. The system comprises the inspection knowledge base. The inspection knowledge base is used for providing the equipment information and inspection index to an inspection task module, providing the collecting protocol and collecting script to an inspection task executing module, and providing the judgment standard to an inspection report module. The inspection task module is used for generating the inspection task. The inspection task executing module is used for automatically executing the inspection task in the inspection task module. The inspection report is used for presenting an inspection result in the manner of a report form. The requirement for the daily inspection can be satisfied, and the control of equipment access authority is guaranteed in the greatest degree.