The invention relates to a resistance adjusting method for a thermistor. The method comprises the following steps: acquiring a resistance increasing rate range corresponding to each of multiple preset patterns, wherein the preset patterns are used for being formed on a chip resistor to be subjected to resistance adjustment and increasing the resistance of the chip resistor to be subjected to resistance adjustment; measuring the actual resistance of the chip resistor to be subjected to resistance adjustment, and calculating an increasing rate needed for reaching a target resistance; judging a resistance increasing rate range within which the needed increasing rate falls, and acquiring the corresponding preset pattern; and applying the acquired preset pattern to the chip resistor to be subjected to resistance adjustment for performing fine adjustment. The method can be applied to adjusting the resistance of the thermistor. The condition that a resistance adjusting error is caused by heat generated by laser is avoided.