Truck door plate trigger alarm device

The utility model provides a truck door plate triggering alarm device, and belongs to the technical field of truck door plates. The truck door plate triggering alarm device comprises a first supporting plate, a first movable door, a first static contact, a second static contact, a first conductive piece, a first movable contact, a second movable contact, a power supply, an alarm, a first conductive wire, a second conductive wire, a third conductive wire and a first elastic connecting piece. When the first movable door is closed, the first elastic connecting piece extrudes one end of the firstelastic connecting piece to be stressed and compressed to drive the first conductive piece to move towards the first preset direction so as to separate the first movable contact from the first staticcontact; when the first movable door is opened, the first movable door extends to drive the first conductive part to move in the second preset direction so that the first movable contact can abut against the first static conta