The invention discloses an antitheft bolt. The antitheft bolt comprises a hexagonal torsion disc mechanism, an inner screw rod mounting mechanism, a first functional bolt mechanism, a second functional bolt mechanism, a third functional bolt mechanism and an inner limiting rod mounting mechanism. One side of the hexagonal torsion disc mechanism can be connected with the inner screw rod mounting mechanism or the inner limiting rod mounting mechanism. One side of the inner screw rod mounting mechanism can be connected with the first functional bolt mechanism and the second functional bolt mechanism. One side of the inner limiting rod mounting mechanism is connected with the third functional bolt mechanism. A threaded hole is formed in one side of the first functional bolt mechanism. The antitheft bolt is compact in structure, convenient to use and practical in function, is conveniently demounted by professionals in the future and can be used for various mechanical assemblies needing to be conveniently demounted and mounted, different holes correspond to the different mounting mechanisms, diversity is improved for the type of bolts, and the universality of the available field is improved.