Elevator car inclination detection method and system and elevator

The invention provides an elevator car inclination detection method and system and an elevator, and relates to the technical field of elevator car fault detection. The elevator car inclination detection method comprises but not limited to at least one of the following steps that a first image of the outer contour of an elevator car is collected in the preset direction at a first position, a second image of the outer contour of the elevator car is collected in the preset direction at a second position, and the second position and the first position can be the same as or different from each other; comparing the second image with the first image to obtain a comparison result; and whether the elevator car inclines or not is determined according to the comparison result. According to the method, the posture of the lift car can be represented through the image of the outer contour of the lift car, whether the lift car is inclined or not is judged through the obtained first image and second image of the outer contou