Anti-theft structure of fastener and recovery tool thereof

The invention discloses an anti-theft structure of a fastener. The anti-theft structure of the fastener comprises a body provided with threads and a protective jacket provided with a drive structure. The protective jacket is connected with the body through a plurality of connecting pieces. Each connecting piece is tin alloy. The sintering temperature of the tin alloy ranges from 185 DEG C to 235 DEG C. Parts in contact with the connecting pieces comprise at least one iron piece. The body, the connecting pieces and the protective jacket are combined into a whole through sintering of the connecting pieces. In the process of fastening of the fastener, a shear failure happens to each connecting piece under the action of certain torsion, slipping happens to the protective jacket and the body, and therefore the anti-theft function on a device where the fastener is arranged is achieved. According to each connecting piece, recombination of the protective jacket and the body is achieved through a recovery tool, and non-destructive detachment of the fastener is achieved.