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The invention discloses a wind power plant layered multi-source data fusion processing method and system based on edge calculation. The method comprises the steps of collecting multi-source data; performing timestamp alignment on the multi-source data by adopting a sliding window alignment algorithm in combination with an interpolation method, calculating an arithmetic mean value of the data in a window through a sliding window with a preset unified period, and outputting a unified frequency data set; taking a uniform frequency data set output by the data layer as input, extracting unit operation event information, monitoring equipment alarm information, time domain features, frequency domain features and time frequency domain features, and performing fusion processing on the extracted features by adopting attention mechanism fusion, association rule mining and clustering fusion algorithms to generate feature information; and feature information output by the feature layer and real-time operation data of the SCADA system are obtained, and a control instruction is generated based on multi-level threshold setting, performance degradation index evaluation, decision confidence judgment and economical efficiency evaluation. According to the invention, the problems of data island, shallow fusion level and resource waste in the prior art are solved.