The utility model discloses a tensile force detecting device for a steel wire rope of an elevator. The tensile force detecting device comprises a bracket; connecting plates are fixedly arranged at the upper end and the lower end of the bracket respectively; a semicircular component with a rope race is fixedly arranged at the side part of each connecting plate respectively; the middle part of the bracket is hinged with that of a rotating rod; a digital display torque wrench is mounted at one end of the rotating rod; a roller wheel with a rope race is mounted at the other end of the rotating rod; and a limiting position for limiting the position of the digital display torque wrench is also mounted on the bracket. The tensile force detecting device for the steel wire rope of the elevator is high in detection accuracy and low in manufacturing cost.