The invention relates to a method for improving the hybrid seed production yield of cabbages in facility, and belongs to the technical field of vegetable farming. The method includes the steps of seeding and seedling raising, land preparation and bedding, field planting of parent materials, bolting, bee depositing for fertilization, harvesting and the like. According to the method, seed productionof hybrid seeds of the cabbages in the facility is adopted, exotic other-cabbage pollen is effectively avoided, and the purity of the hybrid seeds is ensured; in the facility, black mulching film islaid, the growth of weeds can be effectively inhibited, the method also plays the roles of cooling and moisturizing the ground, and in this way, farm operation such as weeding and watering during beepollination can be reduced as far as possible; bees and mason bees are adopted to conduct matched pollination, and the mason bees are used for solving the problem that in a facility greenhouse, illumination is deficient, the temperature is high, the activity space is small, and bee pollination is deficient; the method not only can improve the yield of hybrid seed production, but also is low in cost, and reference is provided for facility seed production of other cruciferous crops.