The invention relates to a preparation method of a lithium ferrous silicate material. The method comprises the following concrete steps of: step 1, sequentially adding sodium silicate or ethyl orthosilicate and a surface active agent into a solvent 1, evenly mixing and then adjusting the pH to be 3-12, then, filtering and washing the product to be neutral, and carrying out spray drying to obtain silicon ion precipitate; step 2, sequentially adding oxalic acid and the silicon ion precipitate obtained in the step 1 into a solvent 2, fully mixing and then adjusting the pH to be 2-6 by organic acid, then, adding an iron source compound into the product, filtering and washing, and carrying out spray drying to obtain coprecipitate of silicon ions and iron ions; step 3, sequentially adding a lithium source compound, organic acid and a carbon source compound into the coprecipitate of silicon ions and iron ions obtained in the step 2, carrying out wet grinding and vacuum drying to obtain a lithium ferrous silicate precursor, and finally, sintering the lithium ferrous silicate precursor to obtain the lithium ferrous silicate material. The preparation method is simple, and the obtained lithium ferrous silicate material is consistent in morphology and even and small in particle size.