Plant extract formula and preparation method for compound molluscicide

The invention provides a formula of a compounded plant extract biological molluscicidal pesticide. The formula comprises 40% of an achyranthes bidentata extract, 10% of 80% tea saponin, 8% of gypsum powder, 1% of an attractant and 41% of flour, wherein the tea saponin and the plant extract of achyranthes bidentata are compounded, metaldehyde in a traditional pesticide can be replaced, and the dosage of field chemical pesticides is reduced; people are prevented from possible diseases and even cancers, or even possible damage to the genetic mechanism of organisms and generation of gene mutation under the condition of long-time contact with the field chemical pesticides; and according to the invention, the potential harm of metaldehyde to the environment and human beings can be reduced, pesticide effect is obvious, pesticide application cost is reduced, an ecological environment is protected, and the compounded tea saponin and achyranthes bidentata have an addition effect on respective snail killing effect. 一种复配