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The olfactory system plays a key role in various insect behaviors, and odorant-binding proteins participate in the first step of the olfactory process. <i>Ophraella communa</i> Lesage is an oligophagous phytophagous insect that is a specific biological control agent for <i>Ambrosia artemisiifolia</i> L. The leaf beetle must identify and locate <i>A. artemisiifolia</i> through olfaction; however, its odorant-binding protein (OBP) function has not yet been reported. In this study, <i>OcomOBP7</i> was cloned, and its tissue expression profile and binding ability were analyzed using RT-qPCR and fluorescence binding assays, respectively. Sequence analysis demonstrated that <i>OcomOBP7</i> belongs to the classical OBP family. The RT-qPCR results showed that <i>OcomOBP7</i> was specifically expressed in the antennae, indicating that <i>OcomOBP7</i> may be involved in chemical communication. The fluorescence binding assay showed that <i>OcomOBP7</i> has an extensive binding ability to alkenes. The electroantennography experiments showed that <i>O. communa</i> antennal response to α-pinene and ocimene decreased significantly after interference because the two odors specifically bound to <i>OcomOBP7</i>. In summary, α-pinene and ocimene are odorant ligands corresponding to <i>OcomOBP7</i>, indicating that <i>OcomOBP7</i> is involved in the chemical recognition of <i>A. artemisiifolia.</i> Our study lays a theoretical foundation for research into <i>O. communa</i> attractants, which is helpful for the better biological control of <i>A. artemisiifolia</i> by <i>O. communa</i>.