Floor washing machine

The utility model discloses a scrubber which comprises a scrubber body and a water spraying pipe, the water spraying pipe is arranged in the scrubber body, the water spraying pipe is provided with a water inlet and a water outlet, and the water outlet faces downwards; and a narrow throat is arranged between the water inlet and the water outlet in the inner wall of the water spraying pipe in a shrinking manner. According to the inner wall structure of the water spray pipe, the acceleration principle of a Laval spray pipe is utilized, when water flow quickly flows to the narrow throat inside the water spray pipe from the water inlet of the water spray pipe, the water flow is accumulated and accelerated because the pipe diameter at the narrow throat is reduced, and when the saturated vapor pressure of water is fixed in the sealed water spray pipe, the water flow is accelerated according to the Bernoulli principle. When the pressure is smaller than the saturated vapor pressure of water, cavitation bubbles are gen