The invention relates to a method for rolling a wedge-shaped steel plate by utilizing process control, and belongs to the technical field of medium plate production processes. According to the technical scheme, the method comprises the steps of setting a plurality of points in the length direction and the thickness direction of a slab for producing the wedge-shaped steel plate, wherein each coordinate point is the length from the point to the head of the slab and the thickness of the slab at the point; determining length and thickness variation values according to the shape of a wedge-shaped plate to be produced, and setting a wedge-shaped plate rolling scheme, wherein a setting tool is a Primos online database; and finishing rolling of the wedge-shaped plate through a process control system of a rolling mill. The method has the main advantages that: 1, a conventional normal steel plate cannot be used for supporting in the industries of bridges, buildings, shipbuilding and the like, but the wedge-shaped plate can fill the function, so that wedge-shaped rolling is an innovation point of medium plate rolling; and 2, the production profit of the wedge-shaped plate is far higher than that of the common steel plate, the wedge-shaped plate occupies a leading position and has market value.