The invention discloses a washing machine and an odor removal method and device based on the washing machine. The washing machine comprises a washing machine box, a roller, a heating device, an air return channel and a water inlet assembly. The roller is arranged in the washing machine box and used for containing clothes to be treated. The heating device is arranged between the washing machine boxand the roller and used for heating air entering the roller. The air is used for taking gas on the clothes to be treated out of the roller. The air return channel is arranged between the roller and the heating device and used for conveying the air passing through the roller into the heating device. The water inlet assembly is connected with the air return channel and used for injecting water intothe air return channel to dissolve the gas carried by the air entering the air return channel from the roller. The technical problem that in the related technology, the mode of removing the odor of the clothes based on the washing machine is low in reliability is solved.