The invention provides an anti-seismic bracket and a construction method thereof, and relates to the technical field of underground construction protection. The anti-seismic bracket comprises two baseassemblies, an outer bearing force bracket is jointly connected to the upper surfaces of the two base assemblies, an inner protection bracket is jointly connected to the position, located on the inner side of the outer bearing force bracket, of the upper surfaces of the two base assemblies, a plurality of supporting columns are fixedly connected between the outer bearing force bracket and the inner protection bracket, and connecting columns are arranged between the two adjacent supporting columns. By designing the double-layer arch bracket, a double supporting effect can be achieved for an underground tunnel, the supporting columns and the connecting columns further reinforce the outer bearing force bracket and the inner protection bracket, when the outer bearing force bracket is damagedby external force, the inner protection bracket still has a supporting function, the situation of serious collapse cannot happen, after the occurrence of an irresistible force accident, the damage degree of the whole bracket and the underground tunnel is small, and the safety is greatly improved.