The invention discloses an anechoic chamber for a fan / booster stage aerodynamic noise test, and belongs to the field of anechoic chamber design. The anechoic chamber is of an asymmetric structure, an adjacent wall of a corner of the anechoic chamber is offset towards the inside, and a wall of an offsetting part is in a vertical shape; the wall connected with the offsetting part is in an inclined shape, a fan / booster stage test piece is installed on the inner side of the wall in the vertical shape, and an inner and outer culvert exhaust air system and a tester are arranged on the outer side of the wall; a far field microphone array is arranged on the position of a fan / booster stage test piece diameter which is far away from an inlet of the fan / booster stage test piece and the distance of which is not less than 15 times; and a turbulent flow control panel is arranged on the windward side direction of the fan / booster stage test piece, an air inflowing system is connected with an air inlet of the anechoic chamber, the inner and outer culvert exhaust air system is connected with the anechoic chamber through the fan/ booster stage test piece, and the tester is connected with the fan / booster stage test piece. The anechoic chamber for the fan / booster stage aerodynamic noise test satisfies required conditions of an engineering level fan / booster stage noise test study.