The invention discloses a pollution-free closed automobile part spraying production line. The whole pollution-free closed automobile part spraying production line is an airtight space with the two ends open. A liquid blocking area is formed at the inlet end and isolates a spraying area from the outside through a water curtain. A gas blocking area is arranged at the outlet end and isolates the spraying area from the outside through an air curtain. Meanwhile, redundant paint is recycled in a unified mode, and thus, a pollution-free closed spraying mode is achieved. By adoption of the pollution-free closed automobile part spraying production line, full-automatic spraying is achieved while environmental friendliness is achieved and pollution is avoided, the production efficiency is greatly improved, and the production cost is greatly reduced.