The invention discloses a wagon brake pipe inner wall cleaning machine composed of a blow-dry system, a cleaning system, a cleaning return pipeline, a rinsing system and a rinsing return pipeline. The wagon brake pipe inner wall cleaning machine can repeatedly flush the brake pipe inner wall in a pulse mode using a mixture including heated high-pressure water containing a washing agent and high-pressure wind, stubborn spots on the inner wall can be thoroughly removed, compressed air in a wagon brake system can be made clean. The wagon brake pipe inner wall cleaning machine is reasonable in design, compact in structure, advance in technology, easy to operate, stable in operation, and high in degree of automation, so the wagon brake pipe inner wall cleaning machine is an idea device for cleaning the inner walls of brake pipes of a wagon.