Pile washing-out system of self-elevating wind power installation platform and using method thereof

The invention relates to a pile washing-out system of a self-elevating wind power installation platform and a using method thereof. The pile washing-out system comprises a ship body, pile fixing chambers are arranged at the four corners of the ship body, pile legs vertically penetrate through the pile fixing chambers, pile shoes extending into the seabed are installed at the bottom ends of the pile legs, and pile washing-out pipelines are arranged in the single pile leg and extend downwards to the pile shoes; an air and water supply system is arranged in a cabin of the ship body, comprises a high-pressure water supply system, a low-pressure water supply system and an air supply system, and supplies water or air to the pile washing pipeline through water and air supply pipelines in one-to-one correspondence with the pile legs; during use, high-pressure water is used for flushing the pile shoe smoothly, a gap is formed between the pile shoe and soil, then low-pressure water is poured between the pile shoe and t