Thunberg fritillary bulb weight automatic grading machine

The invention discloses a thunberg fritillary bulb weight automatic grading machine. Thunberg fritillary bulbs are put into a feeding mechanism, and then the thunberg fritillary bulbs originally located in the feeding mechanism are conveyed to a sieving mechanism through a conveying mechanism; the sieving mechanism comprises a selecting assembly and a discharging guide plate, the selecting assembly is used for selecting the thunberg fritillary bulbs conveyed by the conveying mechanism, and only one of the thunberg fritillary bulbs is selected at a time, and the selected thunberg fritillary bulb is put into the discharging guide plate; by arranging a gravity sensor on the discharging guide plate, when the thunberg fritillary bulb is located on the discharging guide plate, the gravity sensorcan sense the gravity of the thunberg fritillary bulb and send out a signal, a first controller can control a first stepping motor to rotate by a corresponding angle according to the gravity of the thunberg fritillary bulb,