The utility model discloses a high performance slit abatvoix and foamed aluminum plate's composite sheet is mainly as sound absorbent. Including upper cover plate, base plate, adhesive layer, angle steel and staple, it sets up slit to go up cover plate surface, the base plate is for arranging the foamed aluminum plate material in the upper cover plate in the base plate bottom surface sets up two the angle steel the angle steel with set up the adhesive layer between the base plate, the staple passes upper cover plate, base plate, adhesive layer angle steel are fixed the composite sheet and are 2MPa~3MPa at cold press pressfitting, pressure, the slit length of upper cover plate is 1mm~4mm, and the width is 30 mu m~60 mu m. This kind of composite sheet has can compromise the fire prevention simultaneously, corrosion -resistant, and intensity is high, and multiple performance such as light because two kinds of materials all belong to and inhale the sound material, makes absorbing effect better after the complex in the aspect of inhaling the sound, is superior to other porous compound abatvoix materials.