1. A method for fingerprint unlocking, comprising: acquiring a first fingerprint image; determining the number of target feature points of the first fingerprint image; acquiring a target adjustment parameter corresponding to the number of the target feature points according to a preset mapping relationship between the number of feature points and adjustment parameters, the adjustment parameters comprising an analog-to-digital converter (ADC) offset and an ADC gain; receiving a second fingerprint image according to the target adjustment parameter; matching the second fingerprint image with a preset fingerprint template; and unlocking a terminal when the second fingerprint image matches with the preset fingerprint template.