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 . <EOS>