The invention relates to the technical field of energetic materials, and particularly discloses a metal corrosion resistant insensitive ammunition and a preparation method thereof. The metal corrosion resistant insensitive ammunition is prepared from, by weight, 0-10% of layered MXene and 90-100% of 3-nitro-1, 2, 4-triazole-5-ketone. The preparation method comprises the following steps of firstly, etching an aluminum layer in an MAX phase with hydrofluoric acid to obtain layered MXene, dissolving the layered MXene and NTO raw materials in absolute ethyl alcohol in proportion, and finally, carrying out evaporative crystallization to obtain the metal corrosion resistant insensitive ammunition. According to the metal corrosion resistant insensitive ammunition, the metal corrosion resistance of NTO is enhanced, and the impact sensitivity and friction sensitivity of NTO are further reduced; and the preparation method is simple, the MAX phase is etched by hydrofluoric acid to obtain conductive MXenes, then the MXenes and NTO are prepared by a recrystallization method, and the preparation method has practical application value.