A centrifugal compressor, comprising: a main shaft; a diffuser, provided with a first thrust bearing at one end away from a diffusion surface; a supporting assembly, provided with a second thrust bearing at one end facing towards the diffuser; and a thrust disk, configured to rotate together with the main shaft, located between the diffuser and the supporting assembly along an axial direction and provided with a thrust portion, and wherein a clearance between one side of the thrust portion and the first thrust bearing and a clearance between the other side of the thrust portion and the second thrust bearing are limited through mutual abutting of the diffuser and the supporting assembly; the centrifugal compressor further comprising a shell and a radial bearing, wherein the supporting assembly comprises: a fixing plate, provided with the second thrust bearing on one side facing towards the diffuser; and a bearing support, arranged on one side, away from the diffuser, of the fixing plate, a first end of the bearing support being connected to the fixing plate, and a second end of the bearing support being connected to the shell and configured to support the main shaft through the radial bearing; the centrifugal compressor being characterised in that a first groove is formed at one end. away from the diffusion surface, of the diffuser, the first thrust bearing is arranged at the bottom of the first groove along the axial direction, and the thrust portion is located in the first groove. a main shaft; a diffuser, provided with a first thrust bearing at one end away from a diffusion surface; a supporting assembly, provided with a second thrust bearing at one end facing towards the diffuser; and a thrust disk, configured to rotate together with the main shaft, located between the diffuser and the supporting assembly along an axial direction and provided with a thrust portion, and wherein a clearance between one side of the thrust portion and the first thrust bearing and a clearance between the other side of the thrust portion and the second thrust bearing are limited through mutual abutting of the diffuser and the supporting assembly; the centrifugal compressor further comprising a shell and a radial bearing, wherein the supporting assembly comprises: a fixing plate, provided with the second thrust bearing on one side facing towards the diffuser; and a bearing support, arranged on one side, away from the diffuser, of the fixing plate, a first end of the bearing support being connected to the fixing plate, and a second end of the bearing support being connected to the shell and configured to support the main shaft through the radial bearing; the centrifugal compressor being characterised in that a first groove is formed at one end. away from the diffusion surface, of the diffuser, the first thrust bearing is arranged at the bottom of the first groove along the axial direction, and the thrust portion is located in the first groove. a fixing plate, provided with the second thrust bearing on one side facing towards the diffuser; and a bearing support, arranged on one side, away from the diffuser, of the fixing plate, a first end of the bearing support being connected to the fixing plate, and a second end of the bearing support being connected to the shell and configured to support the main shaft through the radial bearing; the centrifugal compressor being characterised in that a first groove is formed at one end. away from the diffusion surface, of the diffuser, the first thrust bearing is arranged at the bottom of the first groove along the axial direction, and the thrust portion is located in the first groove.