Cleaning device and method for cleaning cleaning tool by adopting same

The invention discloses a cleaning device which comprises an outer barrel and an inner barrel, and the inner barrel is fixedly or detachably mounted in the outer barrel; wherein a cleaning opening capable of allowing a cleaning tool to extend into is formed in the upper surface of the inner barrel, a scraping and washing piece capable of rotating is arranged on at least one side of the cleaning opening, and a working end is arranged on the scraping and washing piece; the inner barrel further comprises an inner barrel body and a water squeezing bag assembly. The inner barrel body comprises a thin pipe, one end of the thin pipe communicates with the water squeezing bag assembly, and a water spraying opening is formed in the position, close to the cleaning opening, of the other end of the thin pipe and communicates with the cleaning opening. The bag body is extruded, and clean water in the outer barrel is sucked into the thin pipe under the action of atmospheric pressure, is sprayed out from the water spraying o