The invention discloses an antitheft method for the certified property. A system comprises an antitheft door, an alarm main unit and a camera, wear-resisting wheels are arranged at four corners of thebottom of the antitheft door, and a detection head is arranged on one side of the antitheft door; a supporting rod is arranged on the other side of the antitheft door, a telescopic rod is arranged onthe inner side of the supporting rod, and an auxiliary door is arranged on the side, located on the same horizontal line with the antitheft door, of the detection head; a card swiping machine is arranged on one side of the auxiliary door, and the detection head which is arranged on the antitheft door can scan license plates of vehicles; accordingly, the vehicles enter and leave from an automaticinduction opening-closing door, the situation is avoided that security guards and certified property operation personnel manually open the antitheft door, the time is saved, and a mobile phone can remotely control an alarm; when suspicious personnel are found, voice can be transmitted out through a horn hole, thieves can be scared away, the camera can also shoot appearances of the thieves and suspicious personnel, the camera and a support are in sucked connection through a suction disc and connected more conveniently, and the camera is also maintained conveniently when damaged.