A drum washing machine, comprising: a tub; a drum rotatably provided in the tub; an agitator rotatably provided in the drum; a driver in transmission connection with the drum via a main shaft transmitting a torque of the driver directly to the drum; and a planetary gear assembly provided between the main shaft and the agitator and in transmission connection with the main shaft and the agitator and transmitting a torque of the main shaft to the agitator, wherein: the planetary gear assembly is switchable between a first state and a second state; the planetary gear assembly in the first state transmits the torque of the main shaft to the agitator in a same direction, to rotate the agitator and the drum in the same direction; the planetary gear assembly in the second state transmits the torque of the main shaft to the agitator in an opposite direction, to rotate the agitator and the drum in opposite directions, and wherein the main shaft has a cavity extending therethrough in an axial direction thereof, and a second shaft in transmission connection with the planetary gear assembly passes through the cavity, and the main shaft is rotatable relative to the second shaft, thereby driving the drum and the agitator to rotate respectively. a tub; a drum rotatably provided in the tub; an agitator rotatably provided in the drum; a driver in transmission connection with the drum via a main shaft transmitting a torque of the driver directly to the drum; and a planetary gear assembly provided between the main shaft and the agitator and in transmission connection with the main shaft and the agitator and transmitting a torque of the main shaft to the agitator, wherein: the planetary gear assembly is switchable between a first state and a second state; the planetary gear assembly in the first state transmits the torque of the main shaft to the agitator in a same direction, to rotate the agitator and the drum in the same direction; the planetary gear assembly in the second state transmits the torque of the main shaft to the agitator in an opposite direction, to rotate the agitator and the drum in opposite directions, and wherein the main shaft has a cavity extending therethrough in an axial direction thereof, and a second shaft in transmission connection with the planetary gear assembly passes through the cavity, and the main shaft is rotatable relative to the second shaft, thereby driving the drum and the agitator to rotate respectively. the planetary gear assembly is switchable between a first state and a second state; the planetary gear assembly in the first state transmits the torque of the main shaft to the agitator in a same direction, to rotate the agitator and the drum in the same direction; the planetary gear assembly in the second state transmits the torque of the main shaft to the agitator in an opposite direction, to rotate the agitator and the drum in opposite directions, and wherein the main shaft has a cavity extending therethrough in an axial direction thereof, and a second shaft in transmission connection with the planetary gear assembly passes through the cavity, and the main shaft is rotatable relative to the second shaft, thereby driving the drum and the agitator to rotate respectively.