The invention discloses a gear matched type 
threshing and screening device for 
sunflower seeds. The gear matched type 
threshing and screening device comprises a base, a 
threshing tank, a conical threshing 
barrel, a threshing head and a screening tank. The threshing tank is arranged on the base, the conical threshing 
barrel is horizontally arranged inside the threshing tank, a threshing cavity is arranged inside the conical threshing 
barrel, the threshing head is arranged inside the threshing cavity, and the screening tank is slidably mounted on at least two groups of support slide bars. The gear matched type threshing and screening device has the advantages that 
rubbing effects can be realized by threshing protrusions on the threshing head and threshing protrusions inside the threshing cavity, and accordingly threshing can be carried out for the 
sunflower seeds; the gear matched type threshing and screening device with V-shaped 
grinding cavities is long in threshing 
stroke as comparedwith common threshing devices, accordingly, effective threshing can be carried out, threshing effects can be improved, and the purity of the 
sunflower seeds can be guaranteed; a second connecting rodcan be driven by a third connecting rod to move in the left-right directions, accordingly, the screening tank can be driven to move in the left-right directions, the 
sunflower seed sieving speeds canbe greatly increased, and the work efficiency can be greatly improved.