The utility model discloses a wall -hanging washing machine's back outer bucket subassembly with its outer bucket subassembly, wall -hanging washing machine have, the outer bucket subassembly in backincludes: the outer bucket in back, wave filter and vibration sensor, be equipped with on the periphery wall of the outer bucket in back along its radial outside installing support that extends, the wave filter is established on the installing support, vibration sensor establishes on the installing support and with the spaced apart setting of wave filter. According to the utility model discloses awall -hanging washing machine's back outer bucket subassembly has not only promoted the installation stability of wave filter and vibrations sensor, prevents that the work of wall -hanging washing machine from causing adverse effect to wave filter and vibrations sensor, has reduced the degree of difficulty of wave filter with the mounting process of vibrations sensor moreover, provide conveniencefor wall -hanging washing machine's maintenance, moreover, reduced the occupation space of wave filter with the vibrations sensor, guarantee that wall -hanging washing machine's inner structure is compacter.