The invention discloses a preparation method of a cucumber-flavor fine art paint. The preparation method of the cucumber-flavor fine art paint comprises the following steps of mixing the raw materialsincluding, by weight part, 35-45 parts of distilled water, 5-10 parts of cucumber juice, 15-25 parts of hylocereus polyrhizus juice, 5-10 parts of sodium alginate, 5-10 parts of thickener, 1-10 partsof calcium carbonate and 1-4 parts of glycerol and then stirring the mixture at 60-70 DEGC for 50 minutes. According to the preparation method of the cucumber-flavor fine art paint, hylocereus polyrhizus serves as the staple raw materials and the color source and is combined with the cucumber juice into a natural red paint, which is natural, green, environmentally friendly. Also, the cucumber-flavor fine art paint integrates the taste of the hylocereus polyrhizus and the cucumber so that a painted drawing can present a dual three-dimensional feeling with sight and smell.