Centrifugal compressor capacity adjusting device and centrifugal compressor

The utility model discloses a centrifugal compressor capacity adjusting device and a centrifugal compressor, and the centrifugal compressor capacity adjusting device comprises an air suction flow guide shell, an air suction flow guide channel is defined in the air suction flow guide shell; the flow guide blades are arranged on one cross section of the air suction flow guide channel, and the flow guide blades comprise the first flow guide blade and the second flow guide blade; the driving assembly comprises a first driving shaft arranged on the portion, on one side of the air suction flow guide channel, of the air suction flow guide shell and a second driving shaft arranged on the portion, on the other side of the air suction flow guide channel, of the air suction flow guide shell. The first driving shaft is connected with the first guide vane and used for driving the first guide vane to rotate around the axis in the first direction to adjust the flow of the air suction guide channel in the first area, and the