The invention improves a preparation method of a thin sheet type rare earth permanent magnet material, and relates to the technical field of magnetic materials. A method for preparing a thin sheet-type rare earth permanent magnet material, comprising the following steps: (1) Preparation of a main phase alloy, mixing materials containing neodymium, dysprosium, iron, and boron respectively to prepare a main phase alloy, and then pulverizing , grinding, and sieving to obtain the main phase alloy powder; (2) preparation of the grain boundary phase alloy, mixing materials containing neodymium, Co, Mo, boron, and iron respectively, and then performing rapid solidification, and the quenching rate is 27-35m / s, prepare a grain boundary alloy, and then pulverize it to obtain a grain boundary phase alloy powder; (3) Mix the main phase alloy powder, grain boundary phase alloy powder, magnesium oxide, and zinc oxide evenly, then perform molding, press into a sheet-shaped green embryo, and then Sintering, cooling after tempering to obtain thin sheet type rare earth permanent magnet material. According to the preparation method of the thin sheet type rare earth permanent magnet material of the present invention, the prepared rare earth permanent magnet material has excellent magnetic properties, high bending strength and strong corrosion resistance.