The invention discloses a method for modulating the color of plant essence oil handmade soap by utilizing natural pigment. The color modulation method for the handmade soup comprises the steps of selecting vegetable oil and fat or water for dissolving natural red, yellow and blue pigment for preparing pigment solutions, selecting two or three pigment solutions for modulation in proportion, adding plant polysaccharide for emulsifying the modulated pigment, then adding the pigment into soap bases, finally adding plant essential oil for conducting mixing uniformly, and obtaining various colors such as red, orange, yellow, green, cyan, blue and purple. The plant essence oil handmade soap prepared through the method is bright in color and lustre, great in tinting strength and fastness and stable in property, the safety is achieved, no irritation is caused to skin, and the method can be applied to various plant essence oil handmade soup used for facial cleaning, bath, shaving, hair washing and the like.