The invention discloses an image collection device, a photography device and an image collection method. The image collection device comprises a camera device, a
beam splitter,
autofocus devices, an image fitting device and a
control system; the camera device comprises a plurality of cameras and a single-
wavelength filter in front of the cameras; the
beam splitter is arranged in front of the camera device, and the incident light is respectively projected to the cameras; each camera is matched and connected with an
autofocus device, and the
autofocus device controls the focus of the camera; theimage fitting device receives
monochrome images shot by the cameras and fits the
monochrome images into a final image; and the
control system is separately connected with and controls the cameras, the autofocus devices and the image fitting device. The image collection device collects
monochrome images of different colors and fits the monochrome images into the final image more easily, the requirements for the lens is lower, the effect is better, the cost of the image collection device is lower, and the collected
infrared images can be applied to
slit lamp microscopes, surgical microscopes, other medical image collection.