A beam splitting module and a projector device using the same are provided. The beam splitting module comprises a projector, a first reflective mirror and a second reflective mirror. The projector projects a first split image, a second split image and a third split image. The first reflective mirror reflects the first split image to a real image forming plate to form a first projection image. The second reflective mirror reflects the second split image to the real image forming plate to form a second projection image. The third split image is projected on the real image forming plate through a space between the first reflective mirror and the second reflective mirror to form a third projection image.