The invention relates to a single-drum front loading washing machine, in particular to a door of the single-drum front loading washing machine. During washing, the drum of the single-drum front loading washing machine contains washing water, but the outer drum does not contain washing water. At present, the single-drum front loading washing machine still uses the machine door of a drum type washing machine, and the porthole of the machine door of the drum type washing machine cannot directly seal the clothes filling opening of the drum. As a result, the highest washing water level can only reach the lower edge of the clothes filling opening of the drum, so high-water level washing or rinsing cannot be performed. In the invention, a door frame 1 is openably arranged on the shell 11 of the washing machine by a hinge, the porthole 2 is fixed on the door frame by a bearing system and a shock absorbing device, or the machine door which is formed by fixedly combining the door frame and the porthole is arranged on the drum by a hinge, and thus, the porthole seals the clothes filling opening of the drum 9 when the door is closed. Therefore, the washing machine provided by the invention can perform high-water level washing or rinsing, the rinsing effect is improved consequently; and during washing, the small clothes in the drum are prevented from entering the space between the drum and an outer barrel 10 to cause a fault.