The invention discloses a power transmission and transformation project quality management big data statistical analysis system, which comprises a platform layer used for completing power transmissionand transformation project quality management big data processing result integration, a data layer for completing acquisition and processing of multi-source heterogeneous data, and an application layer for responding to the client request, sending the client request to the data layer, integrating processing results of the platform layer and returning the integrated processing results to the client. The invention further discloses a power transmission and transformation project quality management big data statistical analysis method, being characterized in that data accumulated for a long timeare fully utilized, and the project quality level is improved in a targeted mode through the change trend of the data; quality problems found in the same stage of different projects can be subjectedto statistical analysis, related information such as frequency of occurrence of the different quality problems is obtained, and reasons behind the quality problems are analyzed; quality problems occurring in different stages of the same project can be subjected to statistical analysis; and the development trend of the quality problem can be studied and judged.