Safe vacuumizing and full-vacuum oiling device for transformer

The invention discloses a transformer safety vacuumizing and full-vacuum oiling device which comprises a vacuum pumping unit and further comprises a buffer tank, an air inlet connector, an air outlet connector and a vacuum gauge connector are arranged on the buffer tank, the air inlet connector is connected with an oil conservator of a transformer, the air outlet connector is connected with the vacuum pumping unit, and the vacuum gauge connector is connected with the vacuum pumping unit. The height of the air inlet connector is larger than that of the bottom face of the buffer tank. The McLeod vacuum gauge is not directly used on the transformer oil tank, the height difference exists between the air inlet connector and the bottom of the buffer tank, mercury is effectively prevented from flowing backwards into the transformer oil tank, and the transformer is prevented from being damaged; the McLeod vacuum gauge can be safely used, and the vacuum degree of the transformer oil tank can be accurately read; and fu