<p>An externally attached reflecting device comprising a main body (100). The main body (100) is provided with an accommodation part (101) used for accommodating a projector mobile phone. The main body (100) has arranged thereon a reflective mirror component (200) used for reflecting an image projected by the projector mobile phone. The reflective mirror component (200) in the externally attached reflecting device is capable of changing the direction of the image projected by the projector mobile phone then projecting the image onto a projection plane, thus producing a large-sized image and increasing viewing comfort.</p>
