The utility model discloses a power frequency parameter measuring device of high-voltage transmission circuit which belongs to the technical field of power supply measuring. The device comprises a CPU module, an IPM module, a filter circuit, a three-phase transformer, an output sample-taking and control module, an AD converting circuit, a drive circuit, an analogue quantity processing module, and a liquid crystal screen. The device also comprises a frequency-shift signal generating module comprising a phase locked pool circuit chip, a programmable logic circuit chip, etc. The phase locked pool circuit chip is connected outside with power frequency signals, and the high-frequency signals after double frequency obtain frequency-shift signals through the programmable logic circuit chip and connect with the filter circuit through the energy amplification of the IPM module. The programmable logic circuit and CPU module are in communication junction. The utility model avoids that the power frequency interferes signals to impact measuring, and largely reduces the volume and weight of devices needed by tests. The device has compact conformation, accurate measuring, and convenient operation. The device obviously reduces measuring workload, increases work efficiency, and brings great convenience to field tests.