Pen ink bottle

The invention discloses a pen ink bottle. The pen ink bottle comprises a bottle body, a bottleneck and a bottle plug, wherein the bottle body is connected with an L-shaped branch pipe arranged along avertical surface; multiple counter bores are formed in the places, with the same height, on the outer wall of the bottleneck in the peripheral direction at equal intervals; vertical through holes areformed in the lower surfaces of the middle parts of all the counter bores; each vertical through hole communicates with an inner cavity of the bottle body; the bottom surface centers of all the counter bores are connected with horizontal guide rods; all the guide rods stretch over the vertical through holes in the counter bores; sealing rings slidingly sleeve the guide rods; multiple vertical chutes are formed in the places, with the same height, on the inner wall of the bottleneck in the axial direction at equal intervals; multiple slide blocks are arranged on the outer wall of the bottle plug in the peripheral direc