The invention discloses a stage sound box convenient to assemble, and a control system. The stage sound box comprises a sound box main body, a fixed supporting plate and a movable supporting plate arearranged at the bottom of the sound box main body, two groups of moving wheels are rotationally connected to one end of the fixed supporting plate and the movable supporting plate away from the soundbox main body respectively, cross bars are arranged on both ends of one side of the movable supporting plate close to the fixed supporting plate, T-shaped slide connecting blocks are arranged on upper sides of one of the ends of the two groups of cross bars away from the movable supporting plate, equidistantly distributed supporting rods are connected between the two groups of cross bars, and a stop plate is rotationally connected to one side of the movable supporting plate away from the cross bars. According to the stage sound box convenient to assemble disclosed by the invention, before thesound box main body is assembly, the sound box main body can be conveniently moved and can be stopped by the stop plate after being moved, thereby ensuring the stability after the movement, the assembled sound box has good stability, furthermore, the assembly operation is simple, and the efficiency is high, and the control system of the assembled sound box can simultaneously manipulate the outputof the entire sound box group.