The invention discloses a method for realizing adaptive mobile phone energy conservation. The method comprises the following steps of: making a mobile phone enter an intelligent electricity-saving state; sampling and taking photos in front of the mobile phone through a mobile phone camera at intervals to obtain images; and judging whether a human face is in the images or not by a human face identification technology; if a human face image is obtained, performing step 104, i.e. judging whether the identified human face meets a requirement or not, if so, performing step 105, i.e. keeping a motion state, and temporarily shielding electricity-saving operation, otherwise, performing step 106, i.e. entering an electricity-saving mode and waiting for arousing. The scheme has the advantages that: the recognition rate is higher, the power consumption is more accurately controlled (i.e. when to adjust the frequency of a central processing unit (CPU), whether a backlight is turned on or not, whether a system is in a stand-by state or not, and the like). The user experience is higher, and the phenomenon that data loss is caused by energy conservation at the time that the energy should not be saved is avoided.