Research on the electrical characteristics of rock and ore specimens is a fundamental aspect of geophysical exploration. Aiming at the problems of low efficiency and poor anti-interference ability in the measurement of electrical parameters of rock and ore specimens by frequency conversion method, a method for measuring the broadband electrical parameters of rock and ore specimens based on invert-repeated m-pesudo random binary sequence(IRmPRBS) is proposed and the corresponding measurement system is designed. The system adopts the method of coded constant current signal excitation, and uses the frequency distribution characteristics of the coded signal source along with the multi-frequency data processing method. By transmitting a set of coded rectangular wave currents, it efficiently measures the response information at multiple frequency points of rock and ore specimens. This paper introduces the signal characteristics of the inverse-repetitive m-sequence and presents the workflow of the multi-frequency impedance measurement algorithm. Additionally, it investigates the key factors affecting the performance of the Howland voltage-controlled current source through both theoretical analysis and simulation. The main sources of high-frequency impedance measurement errors under experimental conditions are clarified and the calibration scheme is given. Finally, the measurement system is built and the impedance measurement comparison experiment is carried out with the Zurich MFIA impedance analyzer. The results show that: Using a fifth-order signal improves measurement efficiency by 2.3 times compared to the frequency conversion method, and the measurement of different frequency points can be realized by adjusting the signal coding parameters; The system measurement frequency range covers 1 mHz~100 kHz. The maximum measurement error of the impedance modulus of the resistance-capacitance model is about 0.5%, and the phase maximum error is about 23 mrad. The comparison of the results before and after calibration shows the effectiveness of the calibration scheme in high frequency measurement. The system can realize fast and accurate measurement of broadband impedance spectrum, which provides a broadband fast measurement method and technical support for the measurement of electrical parameters of rock and ore specimens. This research holds significant theoretical and engineering application value.