The utility model provides an identification seal and a mutual inductor adopting the identification seal. The identification seal comprises a bolt bar and a buckle, wherein a first end of the bolt bar is provided with a screw cap, and a second end of the bolt bar is provided with a groove or a bulge; the buckle is provided with a through hole with diameter same as that of the bolt bar; the inner wall of the through hole is provided with a buckling component matched with the groove or the bulge; after the second end of the bolt bar is inserted into the buckle, the bolt bar and the buckle form a non-removable integrated structure. The groove or bulge on the bolt bar is connected with the buckling component on the buckle, so that a non-removable structure is formed and a seal effect is achieved.