Environment-friendly dry-type over-spray paint mist separation system

The invention belongs to the technical field of paint mist filtering, and particularly relates to an environment-friendly dry type over-spray paint mist separation system which comprises an air return chamber, a paint spraying chamber, a filtering chamber and a fresh air system, the air return chamber is arranged above the paint spraying chamber, the filtering chamber is arranged below the paint spraying chamber, and the fresh air system is installed between the air return chamber and the filtering chamber; the filter chamber comprises a mixed pressure chamber, a filter unit and a partition assembly, the partition assembly is located in the middle of the filter chamber, the mixed pressure chamber is located above the partition assembly, and the filter unit is located below the partition assembly. When the paper box for replacing the paper box is separated from the original position, the air baffle pops up to stop conveying air containing paint mist to the paper box at the position, then the possibility of dis