The paper designs a circuit measuring resistive current, on the basis of leakage current standard waveform of the surge arrester recommended by the criterion of DL/TS987-2005. The way of current sensor interconnection is used by the system to achieve the output of leakage current and the extraction of third harmonic of the total leakage current is realized through the technique of passing signals through bandpass filter. Then the measurement of third harmonic is attained by the peak detection circuit, and the determination of the fundamental component is achieved through the relationship between third harmonic and fundamental wave. The article introduces the measurement principle, six order multiple negative feedback bandpass filter and the peak detection circuit. The whole circuit is constructed and measured to understand the feasibility of the designing circuit. It is the deviation between test data and input data of the designing circuit in this paper derived from the measurement result approaches 1%, which meets with the acquirement of on-siteSmeasure. Consequently, the circuit designed by the paper could achieve the measurement of the arrester resistive leakage.