Applying big data to the power grid is a hot spot in the information construction of the current power grid system, and it is even more challenging. How to effectively monitor the high-frequency and complex power grid circuits is a research hotspot. In this study, the novel online monitor for smart circuits based on multi-source data is designed. The first step of designed model is the data pre-processing, for the processing process of the intelligent power distribution data, the preprocessing process should be carried out first, including the data screening, normalization and other processes. Then, combining the multi-source data analysis, this study considers 2 aspects: (1) Cross-region proxy; (2) Cross-level proxy. For the implementation of the system, designed LCC-S type magnetic coupling WPT system energy efficiency performance on-line monitor mode is considered. In the testing section, the experiment is taken from a random sample of transformers in the 110 kV power system. After testing the monitoring accuracy, the performance is proven.