The invention belongs to a customized built-in anti-blockage denoising device for a natural gas pipeline and relates to the technical field of pipeline systems. The customized built-in anti-blockage denoising device for the natural gas pipeline is formed by welding a first flange (1), a second flange (2), a silencing outer pipe (3), a silencing inner pipe (4), a seal end (6) and a streamline rectifying shield (8) through flange connecting. The silencing outer pipe (3) with the streamline rectifying shield (8) is fixedly connected with the first flange (1); the silencing inner pipe (4) with the seal end (6) is fixedly connected with the second flange (2) and the silencing outer pipe (3) and the silencing inner pipe (4) are connected by a flange; by taking the first flange (1) and the second flange (2) as the rear parts, multiple seams (5) are circumferentially uniformly distributed in the middle of the silencing outer pipe (3) and the middle front part of the silencing inner pipe (4). The pneumatic noise of the natural gas pipe is controlled in the national standard provisions without generating blockage and influencing the pipeline conveying.