The invention relates to a light high intensity epoxy foaming material and a preparation method thereof. The material comprises the following compositions in weight percentage: 50 to 90 percent of anepoxide resin, 5 to 40 percent of an amine curing agent, 0.1 to 15 percent of azocompound and a hydrazine-type foaming agent, 2 to 20 percent of a toughener, 0.1 to 5 percent of a surface active agent, and 0 to 30 percent of a filling material. The foaming speed and the curing speed of an epoxy foaming curing system are coordinated by the 'prereaction' preparation technique and the 'postcuring' and sizing processes are performed further. Compared with the prior technique, the foam body prepared by the method has smooth surface, the internal bubble structure is compact and even, and the foamingmaterial meets the intensity requirement and the related technical conditions of a fragile cap of various models of missile. At present, the foaming material has been applied to certain models of missile fragile caps and is in mass production; moreover, the foaming material can be applied in the related technical fields where light and high intensity products are required to be manufactured.