Abstract: This article introduces a wireless touch sensor for automatic spraying dust suppression device, based on a microwave module wireless detection technology, the location and state of moving objects can be determined by detecting the relative movement. By detecting relative movement of underground moving objects like people, tramcars, coal bin loading and unloading trucks, it can detect movement state of people, tramcars, coal loading and unloading trucks, and output the electrical signal to control host, and reach the intelligent spraying function of dust suppression devices.