[Aim]  To clarify the role of the NlAKT gene in the feeding and reproduction of the brown planthopper (BPH), Nilaparvata lugens, an important insect pest of rice. [Methods]  The full-length open reading frame (ORF) sequence of NlAKT was obtained based on the BPH genome, and its protein sequence was analyzed using bioinformatics software. RT-qPCR technology was used to investigate its spatiotemporal expression pattern. Finally, RNA interference (RNAi) methodology was used to determine the effect of NlAKT on the expression of the NlVg and NlVgR genes, along with its effects on feeding, ovarian development, and lipid droplet accumulation in the ovaries. [Results]  The NlAKT protein sequence contains characteristic Akt protein domains, including two conserved domains (PH_PKB and STKc_PKB). RT-qPCR results indicate that NlAKT is expressed in all tissues and developmental stages, with higher expression in ovarian tissues and during the adult stage. RNAi significantly reduced NlAKT expression by 88% (P < 0.05). Silencing NlAKT led to a 51.6% decrease in honeydew excretion, a 146% reduction in acquired body weight (P < 0.05), and a 56.4% increase in the number of feeding pores (P < 0.05). All the above parameters were significantly different from those of the control group. Furthermore, knockdown of NlAKT reduced the expression of the NlVg and NlVgR genes by 41.4% and 59.3%, respectively (P < 0.05), resulting in delayed ovarian development and abnormal size and distribution of lipid droplets within the ovaries. [Conclusion] NlAKT is expressed across all developmental stages and tissues of the brown planthopper. Silencing the NlAKT gene reduced feeding behavior, inhibited ovarian development, and affecting lipid droplet size in the ovaries. These results indicate that NlAKT regulates feeding and reproduction in the BPH.