The invention discloses a throttling silencing device which comprises a shell and a throttling silencing part, wherein the throttling silencing part is hermetically covered in the shell, the throttling silencing part is made of microporous material, the shell is divided into a first cavity and a second cavity by the throttling silencing part, the first cavity is communicated with a first refrigerant transmission pipeline from a condenser, and the second cavity is communicated with a second refrigerant transmission pipeline from an evaporator. The throttling silencing device has simple structure, and through a microporous evaporation technology, the energy efficiency of an air conditioner is improved, and energy sources are saved.