Movable spraying robot and freight train side door gap leak repairing method

The invention relates to the technical field of freight train side door gap leak repairing, in particular to a movable spraying robot and a freight train side door gap leak repairing method, and mainly solves the technical problems that existing freight train side door gap leak repairing spraying difficulty is large, spraying quality is difficult to guarantee, and the safety risk is high. The movable spraying robot is provided with a running track, a self-driven trolley, a sliding contact type power connection assembly, a six-axis mechanical arm, a visual capturing assembly, a spraying assembly and a control box, during operation, the self-driven trolley runs to one side of a carriage along the running track, and the visual capturing assembly captures position information and state information of a side door gap; and the control box controls the mechanical arm to act according to the visual signal feedback, so that the spraying assembly sprays glue to seal the side door gap. The movable spraying robot can com