The invention discloses a science popularization display device for displaying a human ear structure and a working principle. The science popularization display device comprises an external ear auricle model, a structure for simulating vibration of a tympanic membrane and a fenestra vestibule membrane through silicon thin membranes, a motor-cam-driven auditory ossicle simulation structure, and a structure for demonstrating the working principle of an internal ear through cooperation of a three-dimensional cochlea model and an LED lamp strip. The basic structure of a human ear is intuitively displayed, the exercise mode of a middle ear and the working principle of the internal ear during working of the human ear are simulated, the collaboration relationship of all the parts of the human ear is demonstrated, understanding is easy, and by cooperating with interaction forms such as audio input and output, the good displaying and science popularization effects are achieved.