The invention discloses Zn-Ni doped ferrous titanate nano-powder and a preparation method thereof. The preparation method specifically comprises the following steps: by taking ferric chloride, zinc nitrate, nickel nitrate and titanium tetrachloride as raw materials, mixing, evaporating, drying, and thermally treating for twice, thus obtaining the ferrous titanate nano-powder; the general formula of the ferrous titanate nano-powder is Fe1-xZnx-yNiyTiO3, wherein x is greater than or equal to 0.1 and less than or equal to 0.3, and y is greater than 0 and less than x; the crystalline grain size is 20 to 50nm. The obtained Zn-Ni doped ferrous titanate nano-powder has different grain sizes and different specific surface areas, and can serve as a catalytic additive for improving solid propellant performance.