One embodiment of the present application provides a vacuum cleaner that includes an air inlet, a filter, a fan, and a main air outlet;the filter has a clean side and an unclean side; an unclean air chamber is formed between the air inlet and the unclean side of the filter;a first air chamber is formed between the clean side of the filter and the fan;an air outlet chamber is formed between the fan and the main air outlet, whereinthe upstream end of the air outlet chamber is connected to the first air outlet chamber;when the vacuum cleaner is in a suction mode, an airflow enters the vacuum cleaner from an external environment via the air inlet under the action of the fan, and sequentially passes through the unclean air chamber, the filter, the first air chamber and the air outlet chamber, and then is discharged via the main air outlet to the external environment which communicates with the main air outlet;the vacuum cleaner includes a self-cleaning air passage and an air supply air passage, whereinthe upstream end of the self-cleaning air passage is communicated to the air outlet chamber, and the downstream end of the self-cleaning air passage is communicated to the clean side of the filter;the upstream end of the air supply air passage is in directly airflow communication with the external environment, and the downstream end of the air supply air passage is in airflow communication with the first air chamber.
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