In this paper, a handheld intelligent susceptibility meter was designed based on the resonance principle, and the calculation formula of the resonance principle method was derived to measure the magnetic susceptibility of rock. The influencing factors of the resonance method were simulated to explore the magnetic susceptibility of rock. The overall design of the instrument was combined with the simulation results and the actual detection needs. The peripheral circuit was built based on LDC1614, and the inductance sensor, signal extraction program and operation interface of upper computer were designed. The prototype of magnetic susceptibility instrument was completed. The instrument is portable (weight only 0.2kg) and easy to operate. The measurement error is less than 5% compared with similar foreign instruments and the accuracy of the instrument can reach 10-7. It is suitable for field and laboratory measurement and has practical engineering value.