Porous single crystals would significantly enhance their catalysis functionalities owing to the combination of structural coherence and porous microstructures.Porous single crystals have wormhole microstructures and then we define them as wormcrystals.The twisted surfaces in porous microstructures would produce surface lattice distortions that give rise to high-energy active surfaces.Here we grow porous iron single crystals at an unprecedented 2 cm scale with a lattice reconstruction strategy and create high-energy surfaces through the control of lattice distortions within a thickness region of 1 ～2 nm.The porous iron crystal therefore boosts electrochemical reduction of nitrobenzene to aminobenzene with ～ 100％ conversion and ＞ 95％ selectivity.The exceptionally high current densities with porous iron crystals represent the first level electrocatalysis performance.The current work would open a new pathway not only to the creation of high energy surfaces but also to the growth of porous single crystals at large scales in wealth of other materials.