Nondestructive detection gray background sensitivity card

The utility model relates to a nondestructive testing gray background sensitivity card which comprises a background area, the background area is a reference background with a certain gray scale, and identification lines are arranged in the background area; four background areas with different gray levels are arranged in total, ten black identification lines with different widths are respectively arranged in the background area of each gray level, and the identification lines are sequentially arranged in parallel in the background areas according to the sizes of the widths. According to the visual examination requirements of industrial standards, the gray scale card with visual detection sensitivity is divided into a plurality of different identification grades according to background reflectivity, and whether the human eye sensitivity ability of a worker meets the requirements or not is detected and judged in real time through identification of the identification lines in the background area on the gray scale