The invention discloses a wall-hanging washing machine. The wall-hanging washing machine comprises a backboard, a drum and a water discharge valve. The backboard is adapted to be installed on the surface of a wall. The drum is adapted to accommodate washing water and be supported by the backboard. A rotatable roller is arranged in the drum. The water discharge valve is used for discharging washing water in the drum and arranged at the back of the drum. A water guide structure used for guiding water from the front part of the drum to the back part of the drum is further arranged in the drum. According to the embodiment, the wall-hanging washing machine has the following beneficial effects: by arranging the water guide structure communicating with the water discharge valve at the bottom of the drum, water flow in the drum is guided into the back of the drum and discharged; therefore, the water discharge system of the wall-hanging washing machine is optimized; the water discharge valve of the wall-hanging washing machine is conveniently installed; and stability and reliability of the water discharge system of the wall-hanging washing machine are improved.