The invention provides a winding reinforced composite material automobile plate spring and a preparation method thereof; the composite material plate spring has a basic structure form which is a combination of a two-dimensional fabric laminated form and a spiral winding structure, fiber preimpregnated fabrics with different materials are adopted in the combined structure, a whole is formed through two-dimensional lamination and spiral winding, and finally, the novel composite material automobile plate spring having the advantages of high strength, high stiffness, small shape deformation quantity, large fatigue resistance strength, long life and strong high and low temperature environment adaptability is prepared through a mould pressing vacuum infusion integrated process; the hybrid fiber material and the novel structure form adopted by the plate spring can adapt to use requirements of vehicles with different loading capacities especially large loading capacity, and the problem of weak interlayer due to lower fatigue load intensity of a traditional composite material plate spring with a single laminated structure is effectively avoided.