The invention discloses a method and system for entering and exiting an elevator automatically. The method may comprise the steps that under the condition that a robot or an intelligent vehicle arrives at a designated position, the elevator is called, and the state of the elevator is acquired; when the elevator is in the state that the elevator arrives, the robot or the intelligent vehicle enters the elevator by detecting the front through a sensor after the first preset time; when the robot or the intelligent vehicle enters the elevator, a designated floor is lightened, and the state of the elevator is acquired; and when the elevator is in the state that the elevator arrives the designated floor, the robot or the intelligent vehicle exits the elevator by detecting the front through the sensor after the third preset time.