The invention discloses a centrifugal type permanent magnet variable frequency compressor which comprises an enclosure, wherein a screw compression mechanism is arranged in the enclosure; a control mechanism is arranged outside the enclosure; the screw compression mechanism comprises a compressor main unit; the compressor main unit is arranged in the enclosure in parallel, and one end of the compressor main unit is connected with the inner side of the enclosure; the other end of the compressor main unit is connected with a shaft coupler; a central bracket is arranged outside the shaft couplerin a sleeving manner; the central bracket is connected with a permanent magnet motor; the lower part of the permanent magnet motor is connected with the inner side of the enclosure through a motor bracket; a centrifugal fan is arranged above the permanent magnet motor; and an automatic water drainer is arranged on one side, which is close to the centrifugal fan, in the enclosure. The centrifugal type permanent magnet variable frequency compressor improves the working efficiency, reduces the production cost and the rejection rate, saves time and labor and is efficient and energy-saving; the steps are simple; and the operation is convenient.