Agency power purchase refers to the role of power supply enterprises acting as user agent service providers, purchasing the electricity required by users from the electricity trading platform at market prices, and settling electricity fees according to the monthly published agency electricity purchase price. As an important part of promoting the marketization of electricity, agency power purchase can promote the high-quality development of the power industry and support the construction of new power systems. In order to normalize the agency power purchase business and ensure the smooth operation of the power purchase mechanism, taking the data of Jiangsu Province from 2013 to 2022 as the indicator, a data governance method for the agency power purchase business is proposed, which predicts the data and analyzes the deviation rate, so as to realize multi-source data fusion governance, and approve the monthly electricity, daily electricity, time-based electricity and load data to ensure that the average monthly forecast accuracy rate reaches 95% or more, realize dynamic monitoring and analysis of key users, and ensure the steady progress and accurate implementation of the agency power purchase business.