It is one of the greatest mysteries that the baryon asymmetry in our universe is so small. It is argued that it may originate from some profound physics beyond the standard model. We investigate the Affleck‐Dine baryogenesis in split supersymmetry, and find that the smallness of the baryon asymmetry is directly related to the hierarchy between the supersymmetry breaking squark/slepton masses and the weak scale. Put simply, the baryon asymmetry is small because of the split mass spectrum. LHC may prove or falsify our scenario.