The utility model relates to a contact-point type antitheft door alarm device, characterized by comprising a DC power supply, a contact point switch and an alarm unit or a bulb, which are all mutually connected in series, wherein the contact point switch comprises a housing, a hinge pin, a spring and a contact point sheet, the front and rear end faces of the housing are fixedly connected with insulating plates, the symmetrical insulating plates are provided with pin holes, the front and rear end faces of the housing are provided with through holes greater than the pin holes and corresponding to the pin holes of the insulating plates, the hinge pin is supported on the insulating plates through the pin holes, the front portion of the hinge pin is fixedly connected with the contact point sheet, the rear end of the hinge pin is connected with the alarm unit through wires, the hinge pin between the contact point sheet and the rear end face insulating plate is sleeved by a spring, between the contact point sheet and the front end face of the housing there is provided a movable insulating insertion plate, and the housing is connected with a power supply. The contact-point type antitheft door alarm device has the beneficial effects that when lawless persons forcedly open an antitheft door or covertly slip into a shop, a contact point is immediately connected with an alarm circuit, the alarm unit emits an alarm sound to remind people or notify the safeguard department through a circuit connected with the alarm unit, thereby increasing use safety of the antitheft door.