Abstract: Proposed is multi-color marker pen which is composed of a cap (200) and a casing (100) covered by the cap (200). The casing (100) is composed of a linear shaft (110) covered by the cap (200) and having the shape of a hollow body, a sealing part (120) coupled to the upper part of the linear shaft (110) and having a guide (121) formed therein, and a button operation part (130) coupled to the upper part of the sealing part (120). A plurality of tubes (300) is provided in the casing (100), and the upper part of each of the plurality of tubes 300 is coupled to the sealing part (120) in which the guide (121) is formed. The button operation part is composed of three buttons, and by pressing the button operation part (130), the lower part of each of the tubes is ejected through a hole (111) formed in the lower end of the linear shaft (110).