Door hinge with switch device

The utility model relates to a door hinge with a switch device, which is used for theft protection and alarm under the condition that a thief opens a door. The utility model comprises a hinge edge of a door leaf and a hinge edge of a door frame, wherein the hinge edge of a door leaf and the hinge edge of a door frame are rotatablely connected through a hinge shaft and a hinge shaft sleeve. The upper part of the hinge shaft is provided with a hollow hinge shaft, and a bar-shaped hole is arranged on the wall of the shaft. A mounting seat for a movable electrode contact head is arranged inside the hollow hinge shaft of the hinge shaft. A movable electrode contact head is arranged on the mounting seat for the movable electrode contact head. The movable electrode contact head slides inside the bar-shaped hole, and the movable electrode contact head is connected with a conducting wire. The hinge edge of a door leaf is connected with a hinge shaft sleeve of a door leaf which is arranged on the hollow hinge shaft. A bar-shaped hole is arranged on the wall of the hinge shaft sleeve of a door leaf. The bar-shaped hole on the hinge shaft sleeve of a door leaf corresponds to the bar-shaped hole on the hollow hinge shaft. One end of the bar-shaped hole on the hinge shaft sleeve of a door leaf is provided with a fixed electrode contact head which corresponds to a movable electrode contact head, and the fixed electrode contact head is connected with a conducting wire. The utility model has the advantage of simple structure, and is convenient for theft protection and alarm.