In order to ensure the energy supply of an in-vivo device of the magnetic tracking system for capsule endoscopy,a kind of low power consumption and high efficiency intelligent power management module was proposed.The management module includes the main controller,boost circuit,non-contact switches,router,and negative charge pump power supply.The boost circuit is gated intelligently to the main controller along with the button battery power.The circuit will turn “off” when the battery voltage is greater than 3.3 V,and it will turn “on” while the battery voltage is less than or equal to 3.3 V,which can save the energy of boost chip and resist the early loss.In addition,the master controller controls the power router according to the working state of the device in the body and the need to gate the subsequent circuit.The experiments prove that the use of the energy management module can extend the working hours of the button battery,minimize the energy loss,and meet the time requirement of the magnetic tracking system for capsule endoscopy to complete the entire digestive tracking examination.