Dual-drum washing machine

A double-drum washing machine, comprising:

• a first outer drum and a second outer drum which are respectively provided with a drum inside, wherein,
• the second outer drum is integrally molded with a connecting part protruding from a surface of the second outer drum, the connecting part extends towards the first outer drum along a radial direction from the surface of the second outer drum, and an end part of the connecting part is in detachable connection with the first outer drum;
• the connecting part includes a boss, a bottom part of the boss extends along a circumferential direction of an outer wall of the second outer drum, an end part of the boss is in detachable connection with the first outer drum and an upper side of the end part is provided with a curved end face, and the curved end face cooperates with an outer wall of the first outer drum,
• a side of the boss is provided with multiple reinforcing ribs extending along an axial direction of the second outer drum and along a direction vertical to the axial direction, and
• the reinforcing ribs extending along the axial direction of the second outer drum have a step-shaped structure, and a height of the step-shaped structure close to the boss is larger than a height of the step-shaped structure far away from the boss.