The invention discloses a novel diffuser for a centrifugal compressor, and belongs to the technical field of compression equipment. The novel diffuser for the centrifugal compressor comprises a disc-shaped diffuser body, and a plurality of diffusion air ducts are evenly arranged on the circumference of the diffuser body. The novel diffuser is characterized in that the diffusion air ducts are continuously arranged outwards from the center of the diffuser body and penetrate through cylindrical hole sections and conical hole sections of the diffuser body; each cylindrical hole section and the corresponding conical hole section are connected end to end and share the common axis; and every two adjacent cylindrical hole sections intersect on the inner side of the diffuser body, so that a sharp oval front edge and a cylindrical throat section behind the sharp oval front edge are formed. According to the novel diffuser for the centrifugal compressor, the diffusion air ducts intersect to form the sharp oval front edge, and the front edge is sharp so that shock wave loss caused by the excessively high flow speed in front of the diffuser can be well avoided, and the pneumatic performance of the high-pressure-ratio compressor is improved.