Fuente: WIPO "tobacco agriculture" The invention discloses a combined automatic seeding device suitable for a porous cavity. A homogenizer is arranged at the bottom of a seed bin, and a seed sorting mechanism is arranged below the homogenizer. Seed sorting grooves are arranged on a sorting disk, and the seed sorting grooves are arranged to hold 1-2 tobacco seeds. When in use, the device of the invention has low requirements on operators. Only according to the operation mode of the invention and through a hole-by-hole hill-seeding mode, hill-seeding of holes of a floating disk can be completed. Thus, the problem that a traditional seeding mode is not easy to control quantity and lots of seeds are wasted is solved. Through automatic seed seeding and seed sorting, the problem that seeds need to take repeatedly from a containerfor seeding each seeding hole is solved, and labor intensity of seeding is reduced. Seeding quantity is fixed and easy to control, seed waste is avoided, and seeding is time-saving and labor-saving.Seeding efficiency is greatly improved, and seeding cost is saved.