Sandwich armor composite is difficult to accurately obtain the propagation velocity of Lamb waves in the structure due to its large thickness, multi-layer and multiple composite structures, which brings great difficulty to the accuracy of damage monitoring. The structure health monitoring technology based on spatial filter can locate the damage without relying on the speed of Lamb waves. Based on this, using the spatial filter damage location method, for a sandwich armor composite with a thickness of 5 mm composed of alumina ceramic, T700 carbon fiber and TC4 titanium alloy. Two sets of piezoelectric sensor arrays are arranged on the surface to obtain the angle of damage relative to the sensor arrays, and then use the formula to calculate the damage location. The experimental results show that the method can locate the damage of sandwich armor composites and the positioning error is within 1cm.