Provided is an underground displacement automatic monitor device. The monitor device comprises a main controller, a humiture sensor, a rainwater sensor, a solar energy charging device, a storage battery, a wireless data transparent transmission device and a plurality of displacement sensor assemblies, wherein the main controller is connected with the storage battery, the humiture sensor, the rainwater sensor, the wireless data transparent transmission device and the displacement sensor assemblies, the solar energy charging device is connected with the storage battery, and the wireless data transparent transmission device is connected with the displacement sensor assemblies. The monitor device can supply power for a monitor for a long time, ensures normal work of the monitor, and can receive data of the monitor in real time and adjust monitor parameters, and therefore a lot of manpower and material resources are saved, and timely transmission of data to a monitoring center is guaranteed.