The invention relates to an automatic dust falling device for a mine and belongs to the technical field of coal mine dust removal. The automatic dust falling device for the mine is simple in structure, convenient to use and capable of effectively reducing raised dust in the coal mining process and optimizing the working environment. According to the technical scheme, the device comprises a dust collection hood arranged on one side of a coal mining drum, the dust collection hood is fixed to a coal mining machine, a guide wheel is arranged at the bottom of the dust collection hood, a guide rail is arranged on a side plate of a scraper conveyer, the guide wheel is installed on the guide rail in a sliding mode, the dust collection hood is provided with multiple dust suction ports, and a dust suction device is connected to the dust suction ports and installed on the side portion of the coal mining machine. The automatic dust falling device is widely used for automatic dust falling in the coal mining process.