The microstructures, solidification behaviour, crystal orientation and magnetic properties of MnSb-Sb eutectic with a high entropy of solution have been studied systematically. The present approach reveals the inherent correlations between them. MnSb-Sb eutectic is characterized by a non-faceted-non-faceted type of growth and well-distributed aligned MnSb rods embedded in a Sb matrix on a micron scale, an ideal composite structure, during directional solidification. The scaling laws of the variation in interrod spacing lambda (or rod diameter d) with growth velocity are quantitatively developed. A parallel orientation relation between [001] of MnSb and rod axis is identified through electron diffraction patterns, indicating that the highly anisotropic composite has been fabricated successfully. The hysteresis loops of directionally solidified MnSb-Sb composites are determined along the MnSb rod axis. The saturation magnetization and constant permeability have been evaluated by considering the alignment, size and magnetocrystalline anisotropy.