The invention discloses an embedded type Linux based data storage method for an electric energy data acquire terminal by using a memory mapping file to store data. The data needed to be read-written is mapped to a user process space through an memory mapping function mmap (Linux system call), and the stored data is accessed in the manner of reading and writing the memory, so that the data storage method has the advantages of data solidification and data storage, without losing data in power failure, convenience in reading and writing, excellent property, cost reduction and the like.