A touch control auxiliary apparatus, protective casing, touch screen and mobile terminal. The touch control auxiliary apparatus comprises: a main body having a touch screen contact surface and a finger sliding surface; a plurality of control lines insulated from one another, the plurality of control lines are in the main body, orthogonal projections of the plurality of control lines onto the touch screen contact surface are parallel to one another, the plurality of control lines are in a same plane, and the plane where the plurality of control lines are located is not coplanar with the finger sliding surface; and a plurality of touch lines insulated from one another, wherein the plurality of touch lines are in the finger sliding surface and the plurality of touch lines are parallel to one another, and the plurality of touch lines are connected to the plurality of control lines in a one-to-one correspondence.