The utility model discloses a multilayer composite indoor wainscot relates to wainscot technical field, including installation bottom plate and decorative panel, decorative panel setting in the one side of installation bottom plate, be provided with the heat insulating plate between installation bottom plate and decorative panel, the one side of installation bottom plate and heat insulating plate is close and is all seted up with the installation groove, and the both sides installation groove are filled with sound insulation cotton, the heat insulating plate is fixed with installation bottom plate through resin cementation, the middle part of heat insulating plate and the one side fixed setting of being close to decorative panel has the wedge strip, the one side of decorative panel is close to heat insulating plate and is seted up with the wedge slot in the position corresponding with the wedge strip, the wedge strip is connected with wedge slot, both ends of heat insulating plate all are seted up with through -hole. The utility model can when the decorative surface is aging, carry out the separate replacement to the decorative surface, need not to replace entire wainscot, not only save time and labour, but also can save the cost.