Abstract: Porous hollow silica (PHS) is an ideal pesticide carrier. However, most organic solvents commonly used in the preparation of silica by conventional soft template method have strong toxicity and volatility, which are harmful to human health and ecological environment. In this study, a simple and green preparation method of pesticide microcapsule sustained-release formulation imidazole-chlorantraniliprole-porous hollow silica (IMI-CHL-PHS) was successfully constructed by using hydrophobic ionic liquid (IMI-SA) with imidazole as cationic ligand and salicylic acid as anionic ligand as soft template and chlorantraniliprole (CHL) as model insecticide. The results showed that the prepared porous hollow silica had a loading rate of 19.43% for chlorantraniliprole. The IMI-CHL-PHS microcapsules had good performance for slowrelease of the drug, and the release rate in acidic conditions was faster than in alkaline conditions. IMI-CHL-PHS microcapsules had a certain degree of photostability. The potting safety test showed that the IMI-CHL-PHS microcapsules had no adverse effect on the growth of ryegrass and Chinese chives at the recommended application concentration and at four times the recommended concentration. The results of biological activity test showed that the activity of IMI-CHL-PHS microcapsules against Galeruca daurica larvae was higher than that of chlorantraniliprole when applied by drip method. At 24 h after treatment, the activity of IMI-CHL-PHS microcapsules against the 1^st day 3^rd instar larvae of G. daurica (LD₅₀ value was 17.59 mg/kg) was 2.8 times that of chlorantraniliprole (LD₅₀ value was 48.40 mg/kg). The activity at 48 h (LD₅₀ value was 2.85 mg/kg) was 17.2 times that of chlorantraniliprole (LD₅₀ value was 43.94 mg/kg). In contrast, the activity of IMI-CHL-PHS microcapsules at both 24 h and 48 h was lower than that of the technical material when the leaf dipping method was used. It is worth noting that the activity of IMI-CHL-PHS microcapsules showed a tendency to increase with time regardless of the treatments used, i.e., the LD₅₀ value at 48 h was lower than that at 24 h, while the activity of the technical material did not change significantly, indicating that the prepared microencapsulated formulation has a good slowrelease performance and could effectively prolong the efficacy period of the technical material.