The invention discloses a method for pollinating early spring crops by domesticating insects at low temperature. The method comprises the following steps: after adult chrysomyia megacephala is sexually mature and copulates, laying eggs, hatching the eggs into larvae, putting the newly hatched larvae of the chrysomyia megacephala into a climate box for raising in a low-temperature domestication environment, keeping the temperature of the climate box at 15-25 DEG C, and raising the newly hatched larvae of the chrysomyia megacephala in the climate box until the newly hatched larvae of the chrysomyia megacephala are initial eclosion adults; and dividing a greenhouse into multiple ridges, planting oilseed rape male parents and oilseed rape female parents in each ridge, and releasing the chrysomyia megacephala to carrying out pollination. According to the method, the chrysomyia megacephala is subjected to low-temperature domestication, the cold resistance and low-temperature activity of the chrysomyia megacephala are improved, the chrysomyia megacephala is released into the greenhouse, and therefore, a brand-new mode for improving the early spring pollination efficiency of insects is provided for agricultural production.