Provided are an automatic control method of a power supply, device and system, the automatic control method of the power supply includes: receiving the detection data of the 3D sensor, and determining whether the target object is human body (S101); according to whether the target object is human body, outputting a power supply control signal to control the state of the controlled device (S102). Since the automatic control method of the power supply uses the 3D sensor, the user does not require to carry additional device for control communication, according to the human body information in the specific area, the working state of the power supply module is automatically managed to effectively avoid energy waste.
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