The invention discloses a zero-current secondary voltage drop dynamic compensation device which comprises a detection unit, a processing unit and a compensation unit. The detection unit is used for detecting the voltage difference between secondary output voltage and input voltage of a meter; the processing unit is used for amplifying voltage difference signals and outputting the voltage difference signals to the compensation unit; the compensation unit is used for converting the amplified voltage difference signals into compensation voltage inputted to the meter. A first input end of the detection unit is connected with a secondary output end, a second input end of the detection unit is connected with an input end of the meter, and an output end of the detection is connected with an input end of the processing unit. An output end of the processing unit is connected with an input end of the compensation unit, and an output end of the compensation unit is connected with the input end of the meter. The voltage difference between the meter and the secondary output voltage is dynamically compensated, and the problem of errors generated by metering of the meter due to secondary voltage drop of a voltage sensor is solved.