In this article, it is proven that the stacking periodicity has an impact on the structural, electrical, and also magnetic properties of the (MnAs)n/(AlAs)n Superlattice using the full potential linearized augmented plane waves (FP-LAPW) method, which is built on the theory of density functional (DFT). The exchange-correlation potential was determined using the GGA-PBE approximation under ambient conditions. Among these effects, the lattice constant and total magnetic moment of the SLs rise linearly as the number of layers increases. The (MnAs)1/(AlAs)1 SL has a half-metallic behavior; however, the (MnAs)2/(AlAs)2 and (MnAs)3/(AlAs)3 has a semi-metallic behavior, and the origin of the (DOS) and the magnetic moment of the SLs are the d states of the Mn atom. These results demonstrate that controlling the number of MnAs layers may be used to engineer the magnetic properties of the MnAs/AlAs superlattice, leading to a novel spintronic device.