Robert Frost is famous for his realistic descriptions of rural life in the United States. The salient feature of Frost's poems is the frequent use of instrumental imagery, but there is little research on it. Taking Frost's several masterpieces as examples, this paper discusses two kinds of tools in Frost's works including labor tools and entertainment tools based on his family background and life experience in order to understand the symbolic meaning and function of tool images and promote readers to fully and deeply understand the theme and connotation of Frost's poems.