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With the growing complexity of electric power and electrical equipment,a higher requirement has been brought up for the safety performance .As an important tool of measuring insulation resistance, Digital megger has been widely used in industrial field.In order to satisfy the measurement precision and the reliability of the megger and achieve a more accurate measurement, a realizable scheme has been put forward based on digital megger switch gear that is based on the S3C2440 embedded platform.This plan will choose a corresponding sampling resistance by judging collected voltage value,and combined with the hardware platform and software design,Introducing the preparation and testing of the drivers and applications respectively.what's more, a good application has been used in practical circuits. After testing, it can achieve the desired results which makes a higher measurement precision and Controls the measurement error about ±2%.