Counterweight-free parallel elevator system and control method

The invention discloses a counterweight-free parallel elevator system; a steel wire rope wound on two rear ends of a traction wheel and a guide wheel is connected with a first lift car and a second lift car respectively. The first lift car and the second lift car are each provided with a leveling induction switch and a weighing device which are electrically connected with a controller. The controller determines one lift car as a leveling lift car and the other lift car as a counterweight device according to the number of floors between the receiving floors of the first lift car and the secondlift car and the target floor; the counterweight weight is calculated according to the load in the first lift car or the second lift car serving as the counterweight device, and when the counterweightweight meets the standard, the leveling is judged according to a leveling signal of the first lift car or the second lift car serving as the leveling lift car, and the first lift car and the second lift car are controlled to