The invention relates to a novel universal wrench. The novel universal wrench is characterized in that the universal wrench is composed of a movable wrench head, a fixed wrench head, a wrench handle and a pin. A plurality of round holes with equal intervals and radiuses are formed in the fixed wrench head, and the movable wrench head is used for changing the size of the opening of the movable wrench head and the fixed wrench head through the pin and the different round holes in the fixed wrench head, so that the application range of the universal wrench is enlarged, the purpose of truly achieving the universal wrench is achieved, and the number of existing universal wrenches carried is reduced, and the purpose that one universal wrench can be used as multiple existing universal wrenches isachieved; and the novel universal wrench is simple in structure and reasonable in design.