Combined sliding rail type sound insulation door

The utility model relates to a combined sliding rail type sound insulation door which comprises a plurality of sound insulation door units and aluminum alloy guide rails. Each sound insulation door unit comprises a sound insulation movable wall framework, an aluminum alloy male groove, an aluminum alloy female groove, two side door panels and sound insulation cotton, the sound insulation movable wall frameworks are filled with the sound insulation cotton, and when every two adjacent sound insulation door units are in butt joint, the aluminum alloy male groove in the sound insulation door unit on the left side and the aluminum alloy female groove in the sound insulation door unit on the right side are mutually embedded; a lower telescopic assembly is installed at the bottom of the sound insulation movable wall framework, and a lower dense rubber sealing sleeve located at the bottom of the lower telescopic assembly is pressed and sealed on the ground decoration layer. An upper telescopic assembly is installed o