The invention relates to an electric energy meter software modular upgrading method and an electric energy meter system, and belongs to the technical field of electric energy meter systems. The electric energy meter software is subjected to module division according to the functions of the electric energy meter. Each functional module compiles and generates a modular file. The application programstorage space of the electric energy meter software is divided. According to the technical scheme, at least two storage subspaces are obtained according to the electric energy meter, each modular fileis upgraded to the corresponding storage subspace, and therefore independent upgrading of each module is achieved, a single-chip microcomputer ROM area of the electric energy meter does not need to be erased, then programs do not need to be integrally updated, the upgrading mode is simple, and the upgrading efficiency is greatly improved.