Incessant power supply unit

The utility model discloses an incessant power supply unit for carry out the uninterrupted power supply for law enforcement record appearance, including main battery module, reserve battery module with switch the module, main battery module is connected with the power input end of law enforcement record appearance, reserve battery module through the switching module and the power input end is connected, main battery module includes removable main battery, and reserve battery module includes backup battery, switches the module and includes detection port and switch tube, and whether the target that detection port is used for connecting the main battery is extracted in order to detect the main battery, give record appearance power supply in -process when the main battery, detection port's testing result make the switch tube be in off -state with prevent backup battery with the power input termination leads to, when the main battery was extracted, detection port's testing result makes the switch tube switch on so that backup battery passes through the power input termination of switch tube and record appearance leads to and give the power supply of record appearance.