Assembled computer drawing pen

The utility model relates to an assembled computer drawing pen, which comprises a pen holder 10, a fitting sleeve 7, a pen cap 1, a pen head 3, a pen nib 2, a through needle 4, a round bar 5, a water storage tank 6, a connecting section 9, a baffle ring 12, an exhaust pipe 8 and a pen core 11. The utility model can suck in ink with different colors and different textures through the pen core 11, the ink in the pen can be kept wet and avoided from dropping by the annular grooves on the outer surface of the water storage tank 6 and by a radial through hole 15, and the thickness specifications of the pen head 3 with the pen nib 2 and the through needle 4 as well as the round bar 5 can be changed according to the requirements of drawing.