Antennal transcriptome information of Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae: Dryophthorinae) is reported with the aim of solving the problem of stored product pests from the perspective of olfactory functional molecules of S. zeamais. The bioinformatics method was used to analyze the antennal transcripts of S. zeamais. Putative genes were identified, and their amino acid content and other physicochemical properties of the candidate genes were predicted. A total of 10 putative chemosensory protein genes and 20 ionotropic receptor genes were identified. One of the 10 chemosensory protein genes was significantly expressed in the antennae of both sexes, among which SzeaCSP7 was enriched in the legs and SzeaCSP10 was highly expressed in the head. In contrast, seven of the 20 ionotropic receptor genes found in S. zeamais were highly expressed in the legs, and another 12 were highly expressed in male and female antennae; SzeaIR2, SzeaIR3, SzeaIR4, SzeaIR10, and SzeaIR15 were specifically expressed in male antennae. We hypothesize that male antennal ionotropic receptor genes are involved in the reception of female sex pheromones. Our results lay a foundation for further study of chemosensory protein and ionotropic receptor genes in S. zeamais and provide a new perspective for controlling stored product pests.