Honghuagang District, Zunyi City, Guizhou Province, develops the characteristic industry of crispy peaches, and at the same time develops the forest economy and promotes the model of planting soybeans in peach orchards to promote rural revitalization. However, due to the different pests and diseases occurring in peach trees and soybeans, the control drugs used are also different, and the existing technology for spraying and controlling peach or soybean seedlings is operated separately and cannot be sprayed together at the same time. This study, based on the actual situation of forest land, develops a spraying device for interplantation in forest (peach tree and soybean) from the aspects of technical solutions, working principles and beneficial effects, in order to solve the problem of low spraying efficiency of spraying control of peach tree or soybean seedlings in the existing technology.