The invention provides a calibration method and a calibration system with high precision for the analog quantity signals of a servo driver. The method comprises the following steps: firstly, selecting n+1 analog quantity signals in an analog quantity signal input range; secondly, reading an ADC (Analog to Digital Converter) conversion value Yi corresponding to every analog quantity signal to obtain n+1 calibration points; thirdly, getting an expression of n line segments determined by n+1 calibration points, storing a slope ki and an offset bi corresponding to every section, and selecting m analog quantity signals Xi' in the analog quantity signal input range; fourthly, reading an ADC conversion value Yi' corresponding to every analog quantity signal and calculating an actual analog quantity signal Si' according to a formula, wherein the calibration of the analog quantity signals of the servo driver is finished if a differential value between every Si' and every Xi' is in an expected error range; the calibration is prompted to be in an abnormal state if a differential value between every Si' and every Xi' is not in the expected error range. The invention further provides a calibration system for realizing the aforesaid method. According to the calibration method and the calibration system, the automation of the calibration and detection processes of the analog quantity of the servo driver can be realized, and the calibration efficiency can be improved.