Electricity saving method and electricity saving device for mobile handheld terminal

The invention provides an electricity saving method for a mobile handheld terminal. Firstly, the time and light intensity parameters in the mobile handheld terminal are preset; secondly, a light intensity inductor is started while the mobile handheld terminal is started and in the normal condition; thirdly, the ambient brightness is judged through the light intensity inductor; fourthly, whether the abrupt change of the ambient light intensity occurs within the abrupt change control time is judged; fifthly, aiming to the judgement result, the low light intensity environment is judged; finally, the power source of the mobile handheld terminal is turned off according to the judgement result. The invention solves the technical problems that the existing mobile handheld terminal cannot self-adapt and adjust, and the light source in the mobile handheld terminal still works when the light is enough to cause unnecessary power loss; the invention has the advantages that the mobile handheld terminal has a simple struct