The utility model relates to a dust-removal device which comprises a dust collecting device and a separating device, a blower, a power source and a refuse container, wherein the inlet of the separating device is connected with the outlet of the dust collecting device through a first duct, the outlet of the separating device is connected with the inlet of the blower through a second duct, the outlet of the blower is connected with the inlet of the dust collecting device through a third duct, and the separating device is communicated with the refuse container. The whole dust-removal device is a closed cycle system, thereby avoiding the secondary pollution to the environment. The end part of a dust collecting pipe of the dust collecting device is provided with fan blades which can form swirling eddy inside the dust collecting pipe, then refuse can be sucked through the swirling eddy, thereby effectively avoiding the rise of refuse including dust and the like. The device has simple structure, easy maintenance and convenient use and can be used again after the refuse in the full refuse container is dumped, thereby greatly reducing operation and maintenance cost.