Abstract: In view of the fact that the electric energy metering device has poor stability and low metering accuracy during charging of DC charging piles of electric vehicles,this paper analyzes and expounds the structure and design process of electric energy metering device based on engineering requirements.This device adopts modularization design which the structure of DSP +ARM and the application of novel type of tunnel magneto reluctance sensor,and constructs electric energy metering device,and the functions of parameter collection,calculation,display and storage are realized.In particular,the tunnel magneto resistance current sensor is used to effectively reduce the influence of heat temperature generated during the long-time and large-current charging of shunt on the electric energy metering.The experiment shows that the system scheme is feasible and practical,and has good application space.