The invention discloses a turbocharger gas compressor with sound attenuation function, comprising a blower impeller, a gas diffusion channel and a gas compressor casing, wherein the gas compressor casing is provided with an air outlet pipe which is provided with a gas compressor silencer. The invention, which realizes external adjustment of gas through improving an engine air inlet pipe arranged behind the turbocharger gas compressor, realizes air flow adjustment and sound attenuation function of supercharging gas, thereby effectively overcoming the adjustment defect of a gas compressor in air flow direction and flow rate inside the prior turbocharger structure.