The invention relates to a sweeping and twisting type three-dimensional blade diffuser. According to the structure, the front edges of blades are designed into a sweeping shape, the sweeping angle ranges from -45 degrees to 45 degrees, and the blades are suitable for incoming flow and are twisted to be expanded into different air flow angles. The main blade is designed into a three-dimensional integral structure from an inlet to an outlet in the axial direction. The flow-dividing blades are arranged on the rear section in a main blade channel. The sweeping and twisting type three-dimensional blade diffuser has the advantages that interaction of shock
waves and a boundary layer is relieved, so that flow in the diffuser is modified; blade surface air flow separation and
load loss which are caused by a relative large positive / negative
attack angle in part of the blades in the high portion are eliminated, flow loss is reduced, and therefore a
stator part diffuser of a centrifugal / oblique flow
gas compressor can reach the higher efficiency and the larger pressure ratio. The strength of the shock
waves is changed and the shock
waves are even eliminated and influence caused by interaction of the shock waves and the boundary layer is relieved; flow loss caused by the overlarge positive
attack angle or the overlarge negative
attack angle is avoided, the expansion capacity and the operation range of the diffuser are improved, and therefore the improvement in the performance of the whole-level
gas compressor is assisted.