Security door mechanism

The utility model discloses an antitheft door mechanism. The door comprises a main door body and an auxiliary door body, an anti-theft mechanism is arranged between the main door body and the auxiliary door body. The anti-theft mechanism comprises a main anti-theft assembly, an auxiliary anti-theft assembly and an anti-theft lock. The main anti-theft assembly and the anti-theft lock are arranged on the main door body. Wherein the main anti-theft assembly is arranged on one side edge of the main door body; the anti-theft lock is arranged on the inner side of the main door body; the auxiliary anti-theft assembly is arranged on one side edge of the auxiliary door body, and the auxiliary anti-theft assembly and the main anti-theft assembly are symmetrically arranged. The locking or loosening state of the anti-theft lock is used for controlling closing or opening between the main anti-theft assembly and the auxiliary anti-theft assembly, the main door body and the auxiliary door body can beeffectively wrapped, a g