The invention discloses a full-automatic color measurement color blending paint spraying system. The full-automatic color measurement color blending paint spraying system comprise a color measurement device, a color blending device and a paint spraying device, wherein the color measurement device is used for obtaining the three primary color RGB information of primary paint, and the color measurement device comprises a photosensitive element, an area measurement instrument and an analog-digital converter; the color blending device is used for blending paint in the same color with the primary paint, and the color blending device comprises a single chip microcomputer, a digital-analog converter, a flow meter, a primary color paint can, a color blending paint can, a one-way throttle valve, a rotating motor and a stirring rod; the paint spraying device is used for spraying the matched paint. The full-automatic color measurement color blending paint spraying system adopts the photosensitive element to measure the color of the primary paint, it is guaranteed that the paint color blended by the color blending device is same with the color of the primary paint, an area to be painted is measured through the area measurement instrument to determine the amount of needed paint, and the waste is avoided. The full-automatic color measurement color blending paint spraying system is convenient and simple to use, accurate in color blending and suitable for conditions that the appearance of wall faces and automobiles and part of other equipment are damaged, spraying maintenance is needed, but the artificial color blending can not be guaranteed to be same with the primary color.