Centrifugal fan with noise reduction function

The utility model relates to the field of centrifugal fans, in particular to a noise reduction centrifugal fan which comprises a centrifugal fan support, a motor and a fan shell are arranged on the centrifugal fan support, the fan shell is provided with an air inlet, an air outlet and an air cavity, an impeller is rotationally arranged at the position, located at the air outlet, of the fan shell, and the impeller is arranged in the air cavity. An output shaft of the motor is fixed to the impeller in the circumferential direction, the fan shell is composed of a first fan shell body and a second fan shell body, an insertion block is connected to the first fan shell body, an insertion groove is formed in the second fan shell body, the insertion block is matched with the insertion groove in an inserted mode, a first locking assembly used for locking the insertion block is arranged on the insertion base, and a second locking assembly used for locking the insertion block is arranged on the insertion base. The inner