Coating pretreatment cleaning system for super-long workpiece

The utility model provides a coating pretreatment cleaning system for an ultra-long workpiece, which can reduce the length and the occupied area of a spraying system chamber body and reduce the input cost of a production line. The spraying section is mounted in the cleaning chamber; an inlet of the first water pump is connected with the first liquid storage tank, an outlet of the first water pump is connected with an inlet of the first liquid inlet pipe, and an outlet of the first liquid inlet pipe is connected with the spraying section; the third valve is mounted on the first liquid inlet pipe; an inlet of a second water pump is connected with the second liquid storage tank, an outlet of the second water pump is connected with an inlet of a second liquid inlet pipe, and an outlet of the second liquid inlet pipe is connected with the spraying section; the fourth valve is mounted on the second liquid inlet pipe; an inlet of the main return pipe is connected with the cleaning chamber, and an outlet is connected