The utility model relates to a screwing tool for moment of force, which comprises a cylinder and a connecting structure, wherein the connecting structure is fixedly connected on the outer periphery of the cylinder and matched with a fastening tool. The cylinder is axially provided with an open through groove, connecting plates are axially fixedly arranged on the outer periphery of the cylinder on two sides of the open through groove correspondingly, and a bolt structure which is arranged between the corresponding connecting plates is used for applying opposite applied force on the connecting plates to lead the cylinder to radially tightly hold towards the center. The screwing tool for moment of force can be more easily sleeved onto a workpiece to be screwed, the cylinder and the workpiece to be screwed are pressed and fixed by the aid of holding force during assembling of the workpiece to be screwed, and thereby damage of the workpiece to be screwed is avoided.