Carpet cleaning machine

The carpet cleaning machine comprises a base and a water tank, a plurality of idler wheels are arranged on the bottom wall of the base, the top wall of the base is in a two-step shape and comprises a first-step top wall and a second-step top wall, the first-step top wall is provided with a positioning protruding part and a power supply base, and a power supply male connector is arranged in the middle of the power supply base. A mounting clamping hole is formed in the second-stage step top wall, correspondingly, the bottom wall of the water tank is in a second-stage step shape and comprises a first-stage step bottom wall and a second-stage step bottom wall, the first-stage step bottom wall corresponds to the first-stage step top wall, a positioning pit is formed in the first-stage step bottom wall, a power connection base is arranged on the first-stage step bottom wall, and a power connection female connector is arranged in the middle of the power connection base; a clamping block is arranged on the bottom wal