This paper explains the emergence of E8 symmetry in condensed matter systems based on the E8‑X unified field theory. It shows that the E8 quasiparticle spectra observed in quantum magnets, topological insulators and cold atom systems are not accidental mathematical phenomena, but natural low-energy projections of the unified universal field. This work builds a direct bridge between high-energy physics and condensed matter physics, and provides testable low-energy evidence for the E8‑X theory.