The invention embodiment provides a power supply method and device. The power supply device comprises the following structures: a detection module connected with a detection pin group of a camera head module and used for generating identification signals according to the detected detection signal on the detection pin group of the camera head module; a power supply identification module connected with the detection module and used for identifying the model of the camera head module according to the identification signal, thereby determining power supply information corresponding to the model of the camera head module; a power up control module respectively connected with the power supply identification module and the power supply module, and used for controlling power supply sequence of at least three power supply units of the power supply module and power supply voltage of each power supply unit according to the power supply information, thereby enabling the at least three power supply units to provide power for the camera head module. The power supply method and device are used for providing power for different model camera head modules used by user equipment in a self-adaptive manner.