Provided is a conjugated dendrimer, having a structure shown by any one of the following structural formulae (I-A, II-A, I-B, II-B). B is a branched conjugated chain unit, selected from units formed by five-membered or six-membered aroma units and having branched structures. Core is a core function modification unit. FG is a tail end function modification unit. m is degree of branching of the branched conjugated chain unit B, and is selected from 2 or 3. n is number of iterations of repetitive units in molecules of the conjugated dendrimer, and is selected from 1, 2, 3, or 4. Also provided is application of the conjugated dendrimer, e.g., application in preparation of functional devices such as ink, a thin film, and a transistor, and application of the conjugated dendrimer serving as a carbon nano tube dispersing agent and a carbon nano tube selective separation agent.
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