The utility model relates to a filling device, but an in particular to live working's electrified filling device of distribution transformer, including first support, second support and can placing the through -hole awl in transformer oiling mouth department, be equipped with cavity oil pipe on the through -hole awl, the floater is connected to cavity oil pipe lower extreme, is equipped with the oil bag on the first support, the wireless electronic fuel tap of oil bag connection, and cavity oil pipe is connected through insulating soft oil pipe to wireless electronic fuel tap, is equipped with the wireless remote control transmission camera that can take transformer oiling situation on the second support. The utility model discloses can realize distribution transformer's electrification and refuel, improve the fortune dimension level of transformer greatly, improve the sale of electricity benefit, in time handle the oilless transformer, guarantee the safety and stability operation of whole distribution network.