The invention provides an electric power data transmission method and apparatus. The method comprises the following steps: collecting electric power operation basic data from an electricity utilization collection system and a PMS production management system, performing normalization and standardization processing on electric power data, performing encryption processing on the electric power databy using security keys with different grades, transmitting the encrypted electric power data to a big data temporary storage platform by using a wireless communication protocol, verifying and decrypting the received electric power data by the big data temporary storage platform, and storing the decrypted electric power data in an electric power storage module of a big data platform. By adoption ofthe electric power data transmission method and apparatus, the security of the communication of an electric power system can be enhanced, the security of an information network of the electric powersystem is ensured, the electric power data transmission speed and efficiency are improved, the electric power data transmission amount is increased, the interconnection of the electric power system isenhanced, the storage security of the electric power data can be improved, the storage amount of the electric power data is improved, and the storage reliability of the electric power data is improved by the blocked storage of the electric power data.