Nitrogen-containing fused tricyclic compound and use thereof as agroforestry insecticide

Disclosed are a nitrogen-containing fused tricyclic compound, an optical isomer, cis and trans isomers or an agromedically acceptable salt thereof, and the insecticidal use thereof in agroforestry. The delayed working effect of the compound on pests such as red imported fire ants can make the pests carry the drug to a nest, thereby having a better killing effect on the whole red imported fire ants nest and the queen ant.