Compressor for refrigeration cycle system

The invention provides a compressor for a refrigeration cycle system, and the compressor is connected with a condenser and an evaporator through pipelines. The compressor comprises a shell and a centrifugal impeller, wherein the centrifugal impeller is positioned in a cavity formed by a shell, the shell comprises a first shell side and a second shell side, the centrifugal impeller is connected with a motor through a rotating shaft, a guide vane type diffuser is arranged on the radial periphery of the centrifugal impeller, the guide vane type diffuser comprises a plurality of first guide vanesand a plurality of second guide vanes, the first guide vanes are connected with the first shell side, the second guide vanes are connected with the second shell side, the first guide vanes have axialwidth T1, the second guide vanes have axial width T2, the guide vane type diffuser has axial width T, and the relation is as follows: T1+T2T2, the radial leading edge size of