The invention discloses a testing device for an interactive impact model of a lander and a soil body, which comprises a crossbeam, a cotton thread, a side column, an upper crossbeam supporter, an impact barrel, a lower crossbeam supporter, a glide guide rail, a computer, a signal processor, a soil box, a movable sliding rail and a displacement meter, wherein the crossbeam and the movable sliding rail are respectively fixed at the top and the bottom of the side column; a center below the crossbeam is fixedly connected with the displacement meter; the upper crossbeam supporter and the lower crossbeam supporter are riveted on the side column; the glide guide rail is fixed through the upper crossbeam supporter and the lower crossbeam supporter; the impact barrel is mounted on the glide guide rail and is tensioned and stabilized through the cotton thread; and the soil box is arranged below the impact barrel. By using the testing device, through controlling a height and the mass of a weight, the soil body is impacted with a predetermined impact speed and an impact mass; the testing parameters needed by an impact are conveniently measured in real time; and the interactive power characteristics in an impact process are reflected.