Fuente: WIPO "processing tomato" The invention relates to the technical field of tomato seed processing, in particular to a multi-stage vibration screening machine for tomato seed processing and a using method of the multi-stage vibration screening machine. A discharging mechanism is mounted on the screening machine body; a material storage mechanism is fixed on the screening machine body; the storage mechanism is communicated with a discharging mechanism; a limiting mechanism is mounted on the discharging mechanism; a supporting mechanism is fixed to the screening machine body. The supporting mechanism and the fixing mechanism are connected in a matched mode. The screened seeds are discharged through the discharging mechanism through the screening machine body, and then the seeds can be discharged into the storage mechanism; by pulling the limiting mechanism, the height of the discharging mechanism can be adjusted, and then an operator can conveniently adjust the seed discharging amount; a material bag is placed on the supporting mechanism in a sleeving mode, the fixing mechanism is pressed by hands, and the material bag can be clamped.