The utility model discloses and provides a filter circuit used for different frequency admittance method metering remote verification different frequency signal measurement. The filter circuit comprises an amplitude stabilization circuit, a frequency selection and voltage dividing circuit, a detection signal difference amplification circuit and a second-order frequency selection and driving enhancement circuit. The amplitude stabilization circuit has the effects of stabilizing input signal amplitude and filtering large signal interference. The effect of the frequency selection and voltage dividing circuit is to remove a low-frequency interference signal and form reference voltage. The effect of the detection signal difference amplification circuit is to amplify a differential input signal. The second-order frequency selection and driving enhancement circuit is composed of four parts of second-order frequency selection, negative feedback, bias voltage regulation and driving enhancement, and has the effect of processing the input signal into a signal capable of being processed by a single-chip microcomputer or an acquisition chip. Functions of 1.6KHZ different frequency signal accurate amplitude limiting, frequency selection, amplification and driving enhancement are realized so that the filter circuit has advantages of being less in components and parts, simple in circuit, great in stability and high in safety.