A two-way photographing system for a mobile terminal, wherein the mobile terminal comprises a front light entrance and a rear light entrance symmetrical to the front light entrance, and the two-way photographing system comprises: a camera module, comprising a rotating mirror and a lens, in which the rotating mirror is rotatable about an axis of the rotating mirror to a front reflection state for reflecting incident light through the front light entrance to the lens or a rear reflection state for reflecting incident light through the rear light entrance to the lens; the rotating mirror comprises a first end close to the front light entrance and a second end close to the rear light entrance; characterized by an approach sensing apparatus, located adjacent to the first end when the rotating mirror is in the front reflection state or adjacent to the second end when the rotating mirror is in the rear reflection state, and configured to detect the first end so as to generate a first detecting signal when the rotating mirror is in the front reflection state, and to detect the second end so as to generate a second detecting signal when the rotating mirror is in the rear reflection state, wherein the approach sensing apparatus comprises: a first approach sensor, located adjacent to the first end when the rotating mirror is in the front reflection state, and configured to detect the first end so as to generate the first detecting signal when the rotating mirror is in the front reflection state; a second approach sensor, located adjacent to the second end when the rotating mirror is in the rear reflection state, and configured to detect the second end so as to generate the second detecting signal when the rotating mirror is in the rear reflection state; and a sensor baseplate, attached to the first approach sensor and the second approach sensor respectively, and configured to convert the first detecting signal and the second detecting signal. a camera module, comprising a rotating mirror and a lens, in which the rotating mirror is rotatable about an axis of the rotating mirror to a front reflection state for reflecting incident light through the front light entrance to the lens or a rear reflection state for reflecting incident light through the rear light entrance to the lens; the rotating mirror comprises a first end close to the front light entrance and a second end close to the rear light entrance; characterized by an approach sensing apparatus, located adjacent to the first end when the rotating mirror is in the front reflection state or adjacent to the second end when the rotating mirror is in the rear reflection state, and configured to detect the first end so as to generate a first detecting signal when the rotating mirror is in the front reflection state, and to detect the second end so as to generate a second detecting signal when the rotating mirror is in the rear reflection state, wherein the approach sensing apparatus comprises: a first approach sensor, located adjacent to the first end when the rotating mirror is in the front reflection state, and configured to detect the first end so as to generate the first detecting signal when the rotating mirror is in the front reflection state; a second approach sensor, located adjacent to the second end when the rotating mirror is in the rear reflection state, and configured to detect the second end so as to generate the second detecting signal when the rotating mirror is in the rear reflection state; and a sensor baseplate, attached to the first approach sensor and the second approach sensor respectively, and configured to convert the first detecting signal and the second detecting signal. a first approach sensor, located adjacent to the first end when the rotating mirror is in the front reflection state, and configured to detect the first end so as to generate the first detecting signal when the rotating mirror is in the front reflection state; a second approach sensor, located adjacent to the second end when the rotating mirror is in the rear reflection state, and configured to detect the second end so as to generate the second detecting signal when the rotating mirror is in the rear reflection state; and a sensor baseplate, attached to the first approach sensor and the second approach sensor respectively, and configured to convert the first detecting signal and the second detecting signal.