Displacement monitoring alarm device

The utility model provides a displacement monitoring alarm device to solve the problem that displacement cannot be monitored during goods transporting by a heavy engineering vehicle and especially to solve the problem that relative displacement between goods and one or more vehicles cannot be monitored during cooperative work of multiple heavy engineering vehicles. The technical scheme of the utility model is as follows: the device comprises a reference monitoring device, a proximity switch, a relay and a sound alarm device; the reference monitoring device comprises a fixing frame and a circular metal sheet arranged on the fixing frame; the proximity switch and the circular metal sheet are arranged oppositely, and the detection surface of the proximity switch and the end face of the circular metal sheet are parallel to each other with the centers aligned with each other; and the proximity switch is connected with the sound alarm device through the relay.