The purpose of this study was to develop a green biological pesticide for the prevention and control of Tetranychus cinnbarinus that are prone to occur in the cultivation of Chinese medicinal materials, the extractive of Capsicum annuum(Linn) was used as raw material to screen and test the dosage of six emulsifiers, defoamers and antifreezes,and examine the rotational shear speed, the formula and preparation process of the biological pesticide of nano-emulsion in water from the extractive of Capsicum annuum(Linn) were determined. Simultaneously, 1.8% of abamectin was used as the positive control to evaluate its insect-resistant effect. The results showed that a single emulsifier could not form a stable water emulsion. The emulsification effect of EL-40 and S-20 was better than that of other emulsifiers. When the ratio of the two was 9∶1, the emulsification effect was the best, with no water separation and a small amount of oil separation. It was found by examination of the rotational shear speed that when the rotational speed was greater than 8 000 r/min, the oil was no longer separated. Zeta potential and nano particle size analyzer showed that the particle size span of water emulsion was the smallest, which was 1.48, when the rotational speed was 9 000 r/min. 0.1% of defoaming agent and 2% of ethylene glycol could achieve the ideal defoaming and antifreeze effect. The insecticidal effect showed that when the product was diluted 100 times(6.3 μg/mL), the cumulative repellent killing rate on the fourth day was 94.9%, which was significantly higher than that of other dilution groups and positive control group, and the effect of 500 times of liquid was equivalent to that of positive control group. In summary, the preparation process of biological pesticides was as follows : 2% of extractive of Capsicum annuum(Linn) diluent, 8% of holly oil, 2% of ethylene glycol, 0.1% of defoamer, 10% of compound emulsifier(EL-40∶S-20 = 9∶1), 80% of distilled water, and the rotational shear speed was 9 000 r/min, the product had a good effect on killing Tetranychus cinnbarinus.
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