The internal and external flushing device of the high-pressure flushing mechanism uses a suspended mobile flushing vehicle as the running carrier of the internal and external flushing pipes, equipped with 4 0.37kw geared motors with brakes, the model is BLD0-35-0.37. The internal and external flushing pipes use 316L stainless steel pipes and are equipped with narrow-angle nozzles, which have achieved the cleaning effect. The flushing motor uses a vertical pipeline pump with a pump power of 37kw. The high-pressure flushing pipe adopts composite hose, which can withstand pressure up to 2MPa and is durable. Compared with traditional flushing, the flushing time is short, and the flushing pressure is high and uniform, which is beneficial to the phosphating coating of the subsequent phosphating process. The high-pressure flushing mechanism can be retrofitted separately.