Screen, screen wall and device for sound insulation and air return

The invention provides a screen, a screen wall and a device for sound insulation and air return, the screen comprises a screen body, a sound insulation layer and a fixing part, and the screen body comprises a sound insulation section extending in the head-tail direction and an air return section located at one end of the sound insulation section; a sound insulation layer is laid on the sound insulation section; the fixing part is used for fixing the screen body at a preset position of a mounting wall body; the air return section is arranged at one end of the sound insulation section and extends towards the inner side, and a plurality of air return holes are formed in the air return section; the screens are connected end to end and fixed to the enclosure bulkhead plate, the sound insulation sections of the screens completely cover the surface of the preset position of the steel enclosure bulkhead, and noise transmission inside and outside the enclosure bulkhead plate is reduced; meanwhile, a plurality of air r