An important communication tool is constituted by language, which is regarded as a social institution. Roman Jakobson’s theory of verbal communication is considered a coherent framework in linguistics and literary criticism, wherein the primary and secondary functions of language are carefully accounted for. Accordingly, specific functions, namely the emotive, conative, poetic, referential, metalingual, and phatic, are created by the orientation of the message toward each communicative factor. The poet's mode of expression and his worldview are significantly influenced by these functions. Sohrab Sepehri’s poetic appropriations can be examined when the achievements of linguistics and the poetic function of language are utilized. The signs of language functions in Sepehri’s poetry are analyzed by the present study, which is conducted through a descriptive-analytical method and is firmly grounded in Jakobson’s theory. The fundamental concepts of life have been expressed by Sohrab in the form of concise sentences of command, prohibition, report, and reference. This expression is achieved through simple language framed by dynamic and vivid images, and is driven by his unique perspective, which is based on rationality, awareness, ontological depth, creativity, a delicate temperament, and a sense of naturalism. It is demonstrated by the findings that all of Jakobson's linguistic capacities have been utilized by Sohrab. The emotive, conative, and phatic functions, blended with poetic elements, are made more prominent by characteristics such as his background as a painter, his travels, and his experiences; meanwhile, the referential and metalingual functions are placed in the subsequent tier. The conveyance of the poet's message and the influencing of the audience have been effectively accomplished by each of these functions.