Noise protection device for multi-arch tunnel

The utility model relates to the technical field of multi-arch tunnels, and provides a multi-arch tunnel noise protection device which comprises a tunnel portal, a fixing frame and first folding doors, the fixing frame is arranged in the tunnel portal, fixing structures are arranged on the two sides of the top end of the fixing frame, and the first folding doors are arranged on the two sides in the fixing frame. A second folding door is hinged to one side of the first folding door, a folding structure is arranged in the top end of the fixing frame, noise reduction structures are arranged on the two sides of the second folding door and comprise bonding layers, sound absorption felts and sound absorption cotton, the bonding layers are arranged on the two sides of the second folding door, the sound absorption felts are arranged on one sides of the bonding layers, and the sound absorption cotton is arranged on the other sides of the bonding layers. And sound-absorbing cotton is arranged on one side of the sound-a