An image scanning device and an image scanning method are provided. The invention is related to a miniaturized image scanning device and an image scanning method. The miniaturized image scanning device includes a housing, a first driving roller set, an entrance sensor, an image sensor, a reflective light source, a transmissive light source, and a control module. The housing has an entrance and an exit. The first driving roller set is disposed in the housing. The entrance sensor is disposed between the entrance and the first driving roller set. The image sensor, the reflective light source and the transmissive light source are disposed between the first driving roller set and the exit. The control module receives and processes signals outputted from the image sensor and the entrance sensor to control the operation of the image sensor, the first driving roller set, the reflective light source and the transmissive light source.