The invention relates to the technical field of backlight plastic frame processing accessory devices, in particular to a backlight plastic frame drying device. Through the backlight plastic frame drying device, an oil paint on a plastic frame can be prevented from adhering, so that the quality of a plastic frame paint layer is improved; the occurrence of the phenomenon that working personnel is scalded by high-temperature air is avoided, so that the potential safety hazard is eliminated, and the practicability is improved; and meanwhile, a volatile organic solvent in the drying process can betreated, so that the pollution caused on the working environment is prevented, the respiratory health of workers is protected, and the use reliability is improved. The backlight plastic frame drying device comprises a base, a left bottom plate, a right bottom plate, a left support plate, a right support plate, a top plate, a front support plate, a back support plate, a pulling rope, a winch, a pulley, a drive gear, a rack, a drying device, a sliding door plate, a support, a fixed pulley, a wire spool, four groups of threaded pipes, four groups of threaded rods, a rectangular frame, multiple groups of square-shaped clamping plates, four groups of ball bearings, a treatment tank, a negative pressure fan, a cotton cloth filter layer, an ultraviolet (UV) photolysis device, an activated carbonfiltration layer and an air pipe, wherein two groups of pothooks are arranged at the bottom ends of the square-shaped clamping plates.