Turbocharger compressor casing structure with sparse S-shaped blade diffuser

The invention discloses a turbocharger compressor casing structure with a sparse S-shaped blade diffuser. The turbocharger compressor casing structure comprises a hollow compressor volute. A diffuser channel is arranged on the gas compressor volute; the diffuser channel comprises a diffusion channel and an annular channel; the diffusion channel is distributed in a surrounding mode and located on the inner side of the annular channel; the annular channel is circumferentially and annularly arranged outside the diffusion channel; the diffusion channel is of a front-back through structure; the inner side of the diffusion channel is provided with air inlets distributed in a surrounding mode and used for sucking air of the external environment. A gas compressor impeller is arranged in the inner side space of the diffusion channel. A plurality of diffuser blades are arranged on the channel wall surface of the diffusion channel in a surrounding manner; the multiple diffuser blades meet the preset sparse S-shaped blad