The invention relates to a method and a system for upgrading an energy efficiency service cloud terminal. The method of the invention comprises the steps as follows: marking off an upgrading server cluster at a cloud platform, configuring cloud terminal upgrading file with different versions in the upgrading server cluster, implanting upgrading packages with different versions in the server cluster to move up upgrading file storage, dynamically generating an upgrading strategy file according to structural changes of a configuration file and a data file, and downloading the upgrading strategy file and the corresponding upgrading packages according to the requirement with the cloud terminal. The method of the invention could intelligently generate the file change information needed in a user-defined upgrading application according to the structural changes of configuration and data, and could finish the updating by changing the upgrading strategy file while the structures of the configuration and the data are changed. The method of the invention reduces the communication pressure brought to the server while a big data energy efficiency cloud terminal is upgraded to avoid the generation of a channel blocking phenomenon, and simultaneously improves upgrading success rate, and solves the problem that upgrading is difficult because of the change of the terminal.