The invention discloses a black soldier fly egg collecting method, which comprises the following steps: nails are nailed at the four corners of a plurality of rectangular wood boards with a specification of 20cm*5cm*1cm, with 1 centimeter away from the edges, and 7 blocks are stacked in a unified direction, and are bound and fixed by using an elastic band to form an egg collecting device; a properamount of chicken manure or pig manure and the like are placed in a plastic square box with a specification of 35cm*25cm*10cm, the box is sealed by using a gauze, and the egg collecting devices are placed at the four corners of the plastic square box; meanwhile, a spraying device is arranged on the top of an adult chamber, and the brown sugar water with a concentration of 5% is sprayed for matingand oviposition supplementary energy of adults; when the adults are not active in the morning, the egg collecting devices are taken out and the eggs are collected, the elastic band is loosened, and the eggs are scraped along the edge of the wood board by using a scraper. According to the invention, the method is simple and reproducible, the used device and material are easy to obtain, the manufacturing difficulty is low, the cost is low, the egg collecting efficiency is high, the damage of the egg blocks is small, and the method is suitable for popularization.