The invention discloses an elevator capable of supporting self-rescuing in a car and a working method thereof, and an elevator mounting structure. The elevator comprises a self-rescuing counterweight, a fixed pulley assembly, a self-rescuing switch, a transmission mechanism, a starting-stopping device, a first buckling part, a weight releasing device and a second buckling part, wherein the fixed pulley is used for connecting the self-rescuing counterweight and the car; the self-rescuing switch and the transmission mechanism are arranged in the car and interconnected; the starting-stopping device and the first buckling part are connected with the transmission mechanism; the weight releasing device and the second buckling part are arranged on guide rails of the elevator; the first bucking part is corresponding to the second buckling part by position; the self-rescuing counterweight is provided with a weight releasing switch; the weight releasing device is connected with the starting-stopping device and the weight releasing switch. According to the elevator capable of supporting self-rescuing in the car, the elevator car can stably arrive at a flat floor in a dangerous case, then the rescuing action can be carried out to rescue the trapped people, and thus the personal safety and property safety of the trapped people can be ensured; the working principle of the elevator is simple and reliable, and the operation mode is simple; in addition, the manufacturing cost of the elevator is low.