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α-RuCl_3, has emerged as a novel 2D material that potentially hosts quantum spin liquid state (QSL). Recent experimental reports of neutron scattering and thermal quantum Hall effect have provided indirect but promising evidence for the existence of QSL in α-RuCl₃. However, numerous controversies still remain in the current literatures about α-RuCl₃, such as its crystal structure and electronic structure. We used a unique surface sensitive technique, low energy electron microscopy (LEEM), combined with dynamical selected-area low energy electron diffraction (μLEED-IV) to study the 2D crystal structure of α-RuCl_3. We found an unexpected diffraction pattern on the surface of α-RuCl₃, which indicates intrinsic surface reconstruction that forms a superlattice. The superlattice most likely originates from the slight shift of atomic positions which results in unit cell distortion. The existence of a surface superlattice may significantly impacts the electronic and magnetic properties which in turn would potentially influence the existence of QSL in α-RuCl₃.