The invention provides a rigid foam capable of reducing noise. The rigid foam comprises polyether polyol, polyether siloxane, dibutyltin dilaurate, a polyoxyalkylene-polysiloxane copolymer and water. The invention has the beneficial effect that the open-cell polyurethane rigid foam with good dimensional stability and noise reduction performance is developed through selection of polyether polyol and a cell opening agent; and the rigid foam is applicable as a sound-absorbing noise-reducing material to occasions with certain requirements on pressure resistance.