The invention discloses a method and device for firmware upgrading of electric energy meters. The method is applied to the electric energy meters which finish firmware upgrading per se in an Ad-Hoc Network. The method comprises sending a broadcast message carrying an electric energy meter identifier obtaining command in the Ad-Hoc Network, wherein the electric energy meter identifier obtaining command is used for indicating the electric energy meters responding to the broadcast message in the Ad-Hoc Network to execute reporting operation of electric energy meter identifiers per se; receiving the electric energy meter identifiers reported by other electric energy meters in the Ad-Hoc Network in response to the broadcast message; sending upgrading commands and firmware documents according to the electric energy meter identifiers, so that other electric energy meters corresponding to the electric energy meter identifiers can receive the upgrading commands and the firmware documents, and the firmware upgrading process per se is automatically executed. By triggering the upgrading of one electric energy meter in the Ad-Hoc Network, the upgrading of other electric energy meters is triggered, the full automatic upgrading of the electric current meters in the whole Ad-Hoc Network is realized, and upgrading efficiency is improved.