The utility model discloses a cable drum of uninterrupted power supply, including electric cable frame, cable, dual supply automatic switchover loop device and power plug, electricity cable frame is both ends confined hollow circular cylinder, is provided with the opening of intercommunication hollow circular cylinder internal cavity on this electricity cable frame's the blind end, dual supply automatic switchover loop device places in this opening, the cable is the twin cable line, twine in the surface of hollow circular cylinder, power plug is all connected to the external line terminal of twin cable line, and its inscription line terminal is all connected dual supply automatic switchover loop device. Dual supply automatic switchover is realized to this cable drum, and dual guarantee laboratory glassware service reliability has improved the efficiency of on -the -spot switch on, has guaranteed the security of power. The power connection adopts the contact pin form, and supply socket that can disect insertion job site, or power department such as terminal row can be applied to any job site in a flexible way.