The invention discloses a box body tone-tuning sound box. The sound box comprises a box body, a loudspeaker arranged on the front side wall in the box body, and a circuit board arranged on the rear side wall. At least one of the side walls surrounding the loudspeaker is a double-layer cavity wall. An inner cavity wall and an outer cavity wall are spaced by a sound emitting channel so as to form the double-layer cavity wall is formed by. The sound emitting channel is set as an open port on the rear side wall of the box body. At least sound passing groove is formed in the inner cavity wall along the horizontal direction. A support seat is arranged on the bottom wall of the box body. The support seat is provided with a lead screw. An advance and retreat slide block sleeves the lead screw in a threaded matching mode. The advance and retreat slide block carries a tone-tuning frame which is open at front and back sides and is capable of covering the circumferential periphery of the loudspeaker. The lead screw is connected with a driving mechanism. The box body tone-tuning sound box has the advantages that mechanical tone tuning is realized, the cost is low, the power consumption is low, the performance is stable, and the sound emitting quality relative to a playing environment can be effectively improved.