The invention provides a novel piston for avoiding cold start ablation. The novel piston comprises an engine piston body and a combustion room body located in the engine piston body, wherein the opening of the combustion room body is located in the upper surface of the engine piston body, and the bottom surface of the combustion room body is of a w-shaped basin-shaped integrated structure; a throat of the combustion room, a bottom room of the combustion room and a bottom table of the combustion room are successively arranged from edge to middle on the combustion room body; a fuel injector is arranged right above the bottom table of the combustion room; electric heaters are arranged below the bottom room of the combustion room; a plurality of spray orifices are formed in the fuel injector;and the electric heaters and the spray orifices are arranged in a one-to-one correspondence manner. The novel piston provided by the invention has the beneficial effects that at cold start of an engine, wall attachment of fuel is reduced, so that the fuel is more uniformly distributed and more fully combusted, the performance of the engine is improved, temperature or stress sudden rise due to local accumulation of liquid fuel is avoided, and therefore, piston ablation is avoided.