The invention discloses an imaging device of a large geotechnical centrifuge, which comprises a camera bracket 27, a two-dimensional moving device, a camera 18, a model casing 26 and a data control and processing device, wherein the camera bracket 27 is fixed outside the model casing 26 of the centrifuge; the two-dimensional moving device which can transversely and vertically move is vertically fixed on an outside frame of the camera bracket 27; the camera 18 is fixed on the two-dimensional moving device, and a lens of the camera 18 is toward the model casing 26; and the two-dimensional moving device and the camera are both electrically connected with the data control and processing device. The device can shoot over against any point of a model, has high definition of images, low cost andeasy implementation and can more favorably analyze the model.