System upgrading method and device for embedded device under small memory

The invention discloses a system upgrading method and device for embedded equipment under a small memory, and the method comprises the steps: the embedded equipment analyzes a file format of an upgrading file package according to a received upgrading instruction, carries out the file verification of the upgrading file package according to the file format, and carries out the upgrading of the upgrading file package when the upgrading file package is determined to be a correct upgrading file package, reading each upgrade file header in the upgrade file package and file information of the corresponding upgrade file according to the file format, storing the upgrade file header and the file information of the corresponding upgrade file in a preset file queue, performing block reading on each upgrade file in the file queue, and checking the read upgrade file to judge whether the read upgrade file is successfully read or not; when reading is successful, corresponding upgrading operation is executed according to the