The utility model discloses a sound box casing, the audio amplifier is including wanting the box, the box comprises preceding case lid and back case lid, preceding case lid passes through threaded connection with the back case lid to be fixed, back case lid is equipped with two side handles and an upper portion handle, a serial communication port, the side grip is equipped with first recess, upper portion department is equipped with the second recess, first recess is equipped with first net strengthening rib, the second recess is equipped with second net strengthening rib, and the box shell covers there is the coating. The net strengthening rib increased the box laterally with intensity and the rigidity on upper portion, reduce the damaged possibility of box shell. The wear strength of the multiplicable box of wear -resistant coating in the box outside.