The invention discloses a box structure of a water channel type cleaning machine. The box structure comprises a box forming a washing space, and is characterized in that the box comprises a water channel body, a local downward-concaved region is formed in the bottom of the water channel body, and a heating assembly is arranged in the local downward-concaved region. The flat-plate type heating assembly is arranged in the local downward-concaved region in the bottom of the water channel body, accordingly, it is unnecessary to additionally install a water softening device, the structure is simplified, and the heat assembly is also convenient to clear; an ultrasonic generation device is arranged at the bottom of the water channel body, so that the cleaning machine is suitable for cleaning vegetables and fruits; the ultrasonic generation device is detachably connected with the bottom of the water channel body, it only needs to replace corresponding damaged components without replacement ofthe whole water channel type cleaning machine when the ultrasonic generation device is damaged, in this way, maintaining is convenient, and costs are also lowered.