Abstract: To better serve the coalfield geological fine exploration and the disaster prevention and mitigation work in the process of coal mining, a method for measuring the resistivity of the borehole section to identify the geological anomaly area using the immersive bore-in-hole resistivity measuring probe is proposed. Based on the symmetrical four-stage device measurement model, we design a signal generation unit capable of generating an adjustable sinusoidal excitation current with a frequency between 0 to 1 MHz, and design a signal acquisition unit with the function of automatic range conversion, including a fully differential amplifier circuit and a high speed AD circuit, and finally use the linear regression analysis method to calibrate the device coefficient K of the developed in-hole resistivity measuring probe. The performance test results show that the resistivity probe has a measurement error of 0.2%, which satisfies the demand of fine detection in hole of coal mine.