Low-decibel silencer

The invention discloses a low-decibel silencer. The low-decibel silencer comprises a cylindrical barrel, an air inlet pipe and an air outlet pipe, a first side cover is welded at the side part of thecylindrical barrel; the end, away from the first side cover, of the cylindrical barrel is in threaded connection with a second side cover; the air inlet pipe is communicated with the central part of the first side cover; the air inlet pipe extends into the cylindrical barrel; the air outlet pipe is communicated with the central part of the second side cover; and the end, opposite to the cylindrical barrel, of the air outlet pipe is connected with a main silencing pipe. The outer side of the end of the main silencing pipe is in threaded connection with a sound insulation disc, four sets of branch silencing pipes are installed on the side of the center of the second side cover in an annular array mode, sintered polypropylene sleeves are installed between the four sets of branch silencing pipes and the main silencing