The invention relates to a coal mine camera protection system with automatic lens replacing, cleaning, dust removing and dust falling functions and application thereof, and belongs to the technical field of mining equipment, which comprises a lens cleaning device, a lens drying device, an internal pressurizing device, an external lens cover, a lens bracket, a shell and a controller. When the lens is replaced, the underground use safety performance of the system is improved through the external lens cover and the internal pressurizing device, the camera window can be cleaned instead of manual work after the system is applied to the site, the labor intensity is reduced, the life safety of personnel is guaranteed, and the system is externally provided with a device capable of sprinkling water to reduce dust and is started when the external dust concentration is too high. The dust concentration around the camera system is rapidly reduced, and the lens cleaning frequency can be reduced. Unmanned cleaning of the camera window is achieved, meanwhile, cleaning and drying work is carried out in the shell, cleaning and drying equipment is isolated from flammable and explosive gas, and explosion-proof design of system equipment is better facilitated.