The invention discloses a software upgrading method and device based on a memory technology device (MTD) partition. The method includes: adding description information and upgrading data of the MTD partition to be upgraded in a software upgrading file; reading the software upgrading file in an upgrading process, and analyzing the description information and the upgrading data of the MTD partition to be upgraded; writing the description information and the upgrading data of the MTD partition to be upgraded in corresponding storage positions in sequence according to MTD partition corresponding relation in description information of an original MTD partition and the description information of the MTD partition to be upgraded; and starting a system uboot, reading the description information of the MTD partition to be upgraded in a memory, assembling MTD partition description information writing parameters, and writing in a system kernel. The method can upgrade the description information of the MTD partition in the upgrading process, and adjustability and using flexibility of the MTD partition of the memory are improved.