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The objective of this study was to elucidate the changes of body weight and nutrients in black soldierfly larvae of different days of age during live storage. In this experiment, 6 kg of larvae at 10 days, 12 days and 14 days old were selected, and each instar was treated with 1 treatment, each treatment was 6 replicates, each replicate was 1 kg, and 3 replicates were weighed at noon every day to measure weight loss. The other three replicates were stored in the same environment, and on the 5th, 10th, 15th, and 20th days, 50 g of larvae were weighed for each replicate, and the nutrient content was determined after drying. The results showed that the absolute loss of fresh weight at 20 days of 12 and 14 days old was about 50%. The dry matter content of larvae stored in black soldier fly for 15 days was significantly greater than that stored for 5 days and 10 days (P<0.05). The crude protein content of 10th and 20th days of 12-day-old and 14-dayold black soldierfly larvae was higher than that of the 5th and initial larvae, and the crude protein content was highest at the 15th day of preservation. The initial crude fat content of 14-day-old larvae was significantly higher than that of other stages (P<0.05). The preservation time had an interactive effect with the age of the day, and the preservation time×day age could significantly affect the crude fat and dry matter content of the larvae of the black soldier fly (P<0.05). This study revealed the change law and consumption degree of nutrients in larvae during in vivo preservation, and under the experimental conditions, 10-day-old black soldier fly larvae were transported and preserved alive, and high nutrients could be obtained within 10 days of storage time. [ABSTRACT FROM AUTHOR]