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Inductance is widely used in modern electronic circuits, and exists in a large number of circuits such as filtering, coupling and oscillation. Therefore, it is of great significance to accurately measure the resistance of inductance [1-2]. Today, the measurement of inductance is mostly measured by bridge method, high-precision bridge test equipment is more expensive. So this article designed a high-precision, low-cost inductor tester. The instrument uses different current value of the constant current source of the inductor for positive and negative charge, and then according to the detection of different current value of the discharge time to obtain the inductance value of its average, and finally get the measured inductance. Completes the design of constant current source charge and discharge circuit, power supply circuit, switch charge and discharge circuit, detection circuit and control circuit [3-4]. The inductance measurement error of the device is within ±5%, which has the characteristics of high sensitivity, fast corresponding speed and low cost, and has wide application significance.