The utility model provides an enclose heat insulating mattress before vehicle, including sound absorption portion and sound insulation portion, wherein: sound absorption portion has an acoustic absorption performance, sound insulation portion with the connection of sound absorption portion has sound insulation property. Enclose heat insulating mattress before vehicle owing to have sound absorption portion and sound insulation portion two parts, can set up sound insulation portion at the position that concentrated in the engine noise source during use, other positions set up sound absorption portion, avoid using the double -layer by a large scale, but reduce cost and weight also can reduce workman intensity of labour.