The utility model discloses a steam muffler used on a sterile cold filling production line, steam silencer, steam Control Valves,desuperheater, pressure reducing valve which comprises a steam muffler main body and a technical loop structure formed by the steam muffler main body and a sterile device, wherein the technical loop structure comprises a steam input valve and a temperature detector which are connected with the front end of the steam muffler main body, steam silencer, steam control valve, desuperheater, pressure reducing Valves a discharge valve connected with the rear end of the steam muffler main body, and a water drain valve connected with an connector on the side face of the rear end of the steam muffler main body. The steam muffler is characterized in that when the device and a pipeline are conducted steam sterilization and steam barrier, the device and the pipeline can form an automatic control group system, namely, when the steam enters the steam muffler main body, noise reducing and energy saving functions can be played, and condensed water can be automatically separated. Compared with the prior art, the steam muffler has reasonable design, simple structure,easy manufacture, few material cost, low production cost and is safe and reliable, thereby having popularization value.