Expandable paint booths are large environmental protection equipment equipped with dust removal and paint spray exhaust treatment devices. Mainly used for painting and sanding of large and heavy workpieces. When the expandable booth is retracted, the product is moved to an appropriate position within the expandable range using a crane, then the crane is removed, and the booth is extended for painting operations. After completion of the work, the booth is retracted again, and the painted product is moved away using the crane. The use of the expandable booth makes the utilization of the work area more scientific and rational.