The utility model discloses a theftproof type transformer oil discharge outlet sealed cap and extracting tool are opened the problem that leads to transformer oil stolen for solving transformer oil discharge outlet sealed cap by irrelevant personnel. A theftproof type transformer oil discharge outlet sealed cap, includes: by the hemispherical cap body that plane and hemisphere face enclose, the centre of sphere department on the plane has offered and has been used for the screw hole with transformer fuel outlet valve matched with, and the handle hole has been offered at the top of hemisphere face, a special extracting tool for installation and dismantlement theftproof type transformer oil discharge outlet sealed cap, special extracting tool includes: one acts on the operating portion of handle hole and the spanner that a AND operation portion connects. Like foretell theftproof type transformer oil discharge outlet sealed cap and extracting tool, the effectual stolen problem of transformer oil that has prevented.