Vacuum generating device

The utility model relates to the technical field of vacuum generating devices, in particular to a vacuum generating device which comprises a vacuum generator and a sleeve arranged at a pipe opening of the vacuum generator in a sleeved mode, the sleeve is installed on the top face of a filter cartridge, a partition plate is arranged in the filter cartridge, and a filter piece is connected to the surface of the partition plate in an inserted mode to filter gas. An elastic knocking piece is arranged on the surface of the filter cartridge, dust on the surface of the filter element can be conveniently vibrated off, and the filter cartridge is of a detachable structure, so that the vibrated-off dust can be conveniently cleaned; the vacuum generating device has the advantages that the filter cartridge is additionally arranged at the pipe opening of the vacuum generating device to filter particulate matter in conveyed gas, the elastic knocking assembly is installed on the outer wall of the filter cartridge, the knock