The invention discloses a steel wire rope tension detection device for a single-rope elevator. The steel wire rope tension detection device comprises a connecting piece. One end of the connecting piece is connected with a steel wire rope, and the other end of the connecting piece is connected with a fixed end. Steel grooves used for bearing containers are formed in the two sides of the fixed end correspondingly. The fixed end and the steel grooves are both provided with through holes. Pin shafts penetrate through the corresponding through holes for fixation. Additional tension detection sensors are arranged between the two ends of the pin shafts and the corresponding steel grooves in the inner sides separately.