The utility model provides a damage detecting device for a container. The device is characterized by comprising a bracket (1), a scanning arm (2) and a terminal device (3), wherein the scanning arm (2) is connected with the terminal device (3) through wired or wireless network; the bracket (1) is made of metal and is of a cuboid shape similar to the shape of the container; the bracket (1) is provided with eight metal rods, and no metal rods are arranged on one surface in contact with the ground; the eight metal rods are fixed at the connecting part; the bracket (1) is non-deformed; movable pulleys are arranged at the lower ends of four metal rods vertical to the ground; the scanning arm (2) can move or slide in parallel along the metal rods; a scanning camera is mounted on the upper surface of the scanning arm (2). With the adoption of the damage detecting device for the container, the input of labor and time can be reduced, and safety risk is avoided due to the fact that workers operate at heights.