Abstract: A noise reduction structure of a supercharger, comprising: a relief channel of the supercharger having a high pressure pipeline and a low pressure pipeline; a silencing assembly which is arranged at a gas communication position between the high pressure pipeline and the low pressure pipeline. The silencing assembly has a plurality of vent holes with a hole diameter smaller than 20 mm, and the silencing assembly is configured in such a way that the high pressure gas only enters the low pressure pipeline after passing through the vent holes when the high pressure pipeline is in communication with the low pressure pipeline. The noise reduction structure of the supercharger mentioned above has good effect of noise elimination during gas release and low costs.