An operation and maintenance system, comprising: a data acquisition module, a data storage module, an exception and fault labeling module, an automatic model training and assessment module, an operation and maintenance management and task execution module, and a result checking module that are interconnected, wherein the data acquisition module is configured to: acquire a plurality of types of log source data input to the operation and maintenance system, and store the plurality of types of log source data in the data storage module; the data storage module is configured to: store the log source data, an operation and maintenance result, labeled source data, a model, and a knowledge base; the exception and fault labeling module is configured to: continuously perform exception and fault labeling on a part of source data in the data storage module, and store labeled source data in the data storage module; the automatic model training and assessment module is configured to: continuously generate and update a plurality of types of operation and maintenance models and knowledge bases, and store the plurality of types of operation and maintenance models and knowledge bases in the data storage module; the operation and maintenance management and task execution module is configured to: set and execute an operation and maintenance task, call an operation and maintenance model and a knowledge base, and store and output an operation and maintenance result, and monitor acquisition of new log data, sequentially activate the exception and fault labeling module and the automatic model training and assessment module to generate new models and knowledge bases or update existing models and knowledge bases; and the result checking module is configured to: check an exception and a fault outputted from the operation and maintenance management and task execution module, and output an exception and a fault confirmed through checking to the exception and fault labeling module. the data acquisition module is configured to: acquire a plurality of types of log source data input to the operation and maintenance system, and store the plurality of types of log source data in the data storage module; the data storage module is configured to: store the log source data, an operation and maintenance result, labeled source data, a model, and a knowledge base; the exception and fault labeling module is configured to: continuously perform exception and fault labeling on a part of source data in the data storage module, and store labeled source data in the data storage module; the automatic model training and assessment module is configured to: continuously generate and update a plurality of types of operation and maintenance models and knowledge bases, and store the plurality of types of operation and maintenance models and knowledge bases in the data storage module; the operation and maintenance management and task execution module is configured to: set and execute an operation and maintenance task, call an operation and maintenance model and a knowledge base, and store and output an operation and maintenance result, and monitor acquisition of new log data, sequentially activate the exception and fault labeling module and the automatic model training and assessment module to generate new models and knowledge bases or update existing models and knowledge bases; and the result checking module is configured to: check an exception and a fault outputted from the operation and maintenance management and task execution module, and output an exception and a fault confirmed through checking to the exception and fault labeling module.