Cleaning machine and cleaning method

The invention relates to a cleaning machine and a cleaning method.The cleaning machine comprises a box body, a bottom spraying arm, an upper spraying arm and a water pumping mechanism, and a water spraying piece transversely extending along the rear side wall of an inner cavity of the box body is arranged in the box body; the front side of the water spraying piece is provided with a spraying opening of a water curtain partition plate which can divide the inner cavity of the box body into an upper cavity body and a lower cavity body which are relatively independent in the vertical direction by spraying water forwards, and the water spraying piece is connected with the water outlet end of the water pumping mechanism. The invention provides a water curtain partition plate which is completely free of gaps or hidden dead corners in a use state, so that residue accumulation can be avoided, and the problem of secondary pollution or peculiar smell caused by stacking of the partition plates is solved. When the whole c