The utility model discloses a special-shaped plate spring, which comprises spring pieces sequentially overlapped from the top down, wherein the middle part of the spring piece is bent downwards to form a concave section with a flat bottom, two ends of the spring piece are straight sections with same thickness, the straight section is thinner than the concave section, and the straight sections are connected with the concave section through transition sections with gradually increased thickness. The special-shaped plate spring has the advantages that, a steel plate spring with composite stiffness applied to a heavy-duty car is provided, the carrying capacity of the car is increased due to reasonable load distribution of each component of the steel plate spring; the steel plate spring has compact structure, light weight, low cost, good maintainability, is convenient to mount, and meets the requirement on lightweight design of modern cars; the motion coordination of a suspension system and a steering system can be obviously improved through the reasonable design of plate spring stiffness and optimized distribution of the steering .