A multifunctional combined pen comprises a pen cap, a pen holder and a pen point, wherein a refill is arranged in the pen holder, the pen cap and the pen point are positioned at different ends of the pen holder, and the refill comprises a mechanical pencil lead and an ink refill. The pen cap comprises a cap tube, an eraser and a correction fluid container, wherein the cap tube is provided with a first groove and a second groove which are opposite to each other, the first groove is used for installing the correction fluid container, and the second groove is used for installing the eraser. The wall of the first groove is provided with a first buckling portion, the wall of the second groove is provided with a second buckling portion, and a third buckling portion is arranged on the pen holder and corresponding to the first buckling portion and the second buckling portion. When the mechanical pencil lead of the multifunctional combined pen is utilized to perform writing, the eraser is exposed out of the pen holder, and the third buckling portion is buckled with the first buckling portion. When the ink refill of the multifunctional combined pen is utilized to perform writing, the correction fluid container is exposed out of the pen holder, and the third buckling portion is buckled with the second buckling portion. By means of the multifunctional combined pen, the mechanical pencil lead and the ink refill can be utilized, and therefore, using requirements of different occasions can be met.