The invention discloses a double-drum washing machine, which comprises a washing machine frame, a first outer drum and a second outer drum, wherein the first outer drum and the second outer drum are arranged in the frame; the first outer drum and the second outer drum are integrally provided with balancing weight mounting columns used for mounting balancing weights; the first outer drum and the second outer drum are connected into a whole through a connecting piece; the connecting piece is fixedly connected with the balancing weight mounting columns on the first outer drum and/or the second outer drum. According to the double-drum washing machine disclosed by the invention, the first outer drum and the second outer drum are connected into an integral structure through the connecting piece so as to effectively improve the compactness of the washing machine; the connecting piece is fixedly installed and connected through the balancing weight mounting columns on the first outer drum or the second outer drum so as to increase the stability of the washing machine; moreover, a shared balancing weight is provided for the first outer drum and the second outer drum through the connecting piece; furthermore, the shared balancing weight is used by the first outer drum and the second outer drum, and the first outer drum or the second outer drum of the washing machine is used as at least one part of balancing weight of the second outer drum or the first outer drum, so that the two drums of the washing machine have an obvious damping effect, and the production cost is reduced.