The invention discloses a low-noise drain pipe which is formed by connecting a first pipe body, a second pipe body, ..., and an n-th pipe body coaxially from inside to outside in a sleeved manner. The inner surface of the first pipe body is provide with multiple spiral grooves which extend along the axial line of the first pipe body; the spiral grooves extend in parallel and mutually wound; the outer surface of the m-th pipe body is a fluctuated curve surface, and the inner surface of the m+1-th pipe body is a fluctuated curve surface which matches with the outer surface of the m-th pipe body; the inner surfaces and the outer surfaces of the second pipe body, ..., and the n-1-th pipe body are waveform curve surfaces with different waveforms; the outer surface of the n-th pipe body is a smooth curve surface; m and n are natural numbers, and m is greater than 1 but less than n; the first pipe body, the second pipe body, ..., and the n-th pipe body are unequal in density. The low-noise drain pipe disclosed by the invention realizes structure improvement of the drain pipe, and achieves good sound attenuation performances and a good sound-isolating effect.