Dual-mode high-pressure waterway system, control method thereof and motor sweeper

The invention discloses a dual-mode high-pressure waterway system and a control method thereof and a motor sweeper, the system comprises a high-pressure water pump, a low-pressure branch and a high-pressure branch, the water inlet ends of the low-pressure branch and the high-pressure branch are respectively communicated with the high-pressure water pump, and the water outlet ends of the low-pressure branch and the high-pressure branch are respectively communicated with an execution assembly; the high-pressure branch comprises a first pressure regulating valve used for regulating pressure and a first pneumatic control cut-off valve used for preventing water from overflowing from the first pressure regulating valve. The low-pressure branch comprises a second pressure regulating valve used for regulating pressure and a second pneumatic control cut-off valve used for preventing water from overflowing from the second pressure regulating valve. Switching of high-pressure flushing and low-pressure flushing can be ac