Based on cloud computing, a smart grid load forecasting platform architecture was presented, and the key technology of cloud computing, the cloud architecture of load forecasting, load forecasting services of cloud platform, etc were expounded deeply.We used Hadoop cloud computing technology to simulate resource scheduling and the calculation of load forecasting of cloud computing, which verified that load forecasting mechanism on the basis of the electric power private cloud was much more superior.At the same time, we introduced multi-dimensional and multi-level coordination and optimization mechanism in cloud platform load forecasting services to revise, coordinate and optimize the original forecast results, which significantly improved the level of the smart grid load forecasting based on cloud platform.The platform framework has provided wide thinking and powerful technical support for smart grid load forecasting.