Multi-section watercolour pencil capable of assembling at will

The utility model relates to a water color pen, particularly a water color pen which has multiple joints, can be freely combined and belongs to the technical field of writing and drawing tools. The utility model is characterized in that the length of each joint of the water color pen is obviously shorter than the length of existing single water color pens; each joint of the water color pen can be combined with another one joint in a head to end nesting type method, and each joint structure of the water color pen comprises a pen tongue (1), a convex arris (2), a rolling and covering core (3), a pen rod (4), a groove (5) and a connecting plug (6).; the water color pen can be used only by inserting one water color pen head of one joint in the connecting plug of the other joint of the water color pen and clamping the convex arris in the groove. A plurality of joints of the water color pens can be freely combined into a water color pen with multiple joints according to the needs of color use, and any color can be very conveniently used by withdrawing the lower part of the joint of the water color pen with the color and inserting the water color pen with the color in the connecting plug of the joint of the water color pen on the highest end. The utility model has the advantages of convenient combination, convenient color change and carrying and can enhance the work efficiency of writing and drawing.