A drum washing machine comprising: a casing (1), an outer cylinder (2) disposed in the casing (1), an inner cylinder (3) disposed in the casing (1), a door (4) provided on the casing (1), and a window gasket (5) for sealing provided between the casing (1) and the outer cylinder (2); wherein comprises: an inner cylinder front flange (32); a flow guiding structure (323) extending forward, which is provided on the inner cylinder front flange (32) and configured to introduce air into the inner cylinder (3) when entering into a spin phase; and a plurality of vents (541) opened at the window gasket (5) which are communicated with a space between the inner cylinder front flange (32) and the outer cylinder (2). When the drum washing machine enters into a spin phase to dewater, with the configuration of disposing the flow guiding structure (323) on the inner cylinder front flange (32), air in front of the inner cylinder front flange (32) could be introduced to the back side of it, and a negative pressure space could be created between the inner cylinder front flange (32) and the outer cylinder (2), and additionally, air around the window gasket (5) could enter into the space between the inner cylinder front flange (32) and the outer cylinder (2) by the vent (541) to create a high volume airflow circulating around the inner surface of the window gasket 5 to dry it quickly, which could speed up drying time, prevent the breeding of bacteria and eliminate the odor.