Obstacle detection device, protection control method of dish washing machine and dish washing machine

The invention discloses an obstacle detection device, a dish-washing machine protection control method and a dish-washing machine. A light source emits a light signal with a specific wavelength, a camera receives an image reflected by the light signal, a narrow-band-pass light filter eliminates interference of ambient light and visible light on the image, and a calculation module calculates the distance between an obstacle and a machine; the judgment module judges whether the distance between the obstacle and the machine is smaller than L or not, and the control module executes a corresponding instruction according to the judgment result of the judgment module, so that the obstacle is detected, and the corresponding instruction can be executed. The light source provides a light source for the whole system, the narrow-band-pass optical filter eliminates interference of ambient light, visible light and the like on the whole picture, the camera receives an image formed by reflection of ultraviolet light, and the