The invention belongs to the field of material science, and particularly relates to a blocky iron nitride-aluminum sintered material and a preparation method thereof. The iron nitride-aluminum sintered material comprises the following components in percentage by mass: 24.3-98.9% of iron nitride and 1.1-75.7% of aluminum or aluminum alloy. The relative density of the iron nitride-aluminum sintered material is greater than or equal to 99.5%. The preparation method of the iron nitride-aluminum sintered material comprises the following steps: mixing 24.3-98.9% of iron powder and 1.1-75.7% of aluminum powder or aluminum alloy powder to obtain an iron-aluminum structure precast block; nitridizing to obtain an iron nitride-aluminum structure precast block; and sintering to obtain the iron nitride-aluminum sintered material. The iron nitride-aluminum s sintered material has the advantages of high hardness, high wear resistance, high strength and high toughness. The preparation method has the advantage of simple technique and is easy to implement.