The invention discloses a power energy-saving control method and system for an intelligent wearable device. The system comprises a Bluetooth module of the intelligent wearable device, an MCU module, an internal timer and a motion state sensor, wherein the MCU module further comprises an energy-saving unit used for monitoring and switch control; the motion state sensor comprises an acceleration sensor and a counter; and the energy-saving unit is in circuit connection with the Bluetooth module, the internal timer and the motion state sensor through the MCU module. According to the power energy-saving control method and system, the analysis and judgment are carried out for a usage state of a wearer of the intelligent wearable device, the switching and management of the motion state sensor and the Bluetooth module of the intelligent wearable device are controlled, and unused functions are reasonably turned off and adjusted, so that the power consumption of the intelligent wearable device can be reduced, the service life can be prolonged, and the use effect can be improved.