A multi-color small amount painting system of the present invention stores small unit amounts of paint having a variety of paint colors and may selectively feed desired color paint to a painter of a painting robot or the like. The painting system stores the paint having a large number of paint colors in a stock unit in the form of paint cartridges (2). The paint cartridge (2) of the paint color selected is picked up from the stock unit (3) and carried by a carrier (4) and is loaded on the painting robot (1) or an automatic painting device. Subsequently, the paint within the paint cartridge loaded is fed to the painter of the painting robot (1) or the automatic painting device by a paint feeding mechanism. In addition, the system ensure an advantage that the painting system is high in efficiency of painting work including the exchange of colors and is small in size as a whole.