The invention relates to a tangential feeding axial flow threshing and separating device, which is used for taking off the grains of crops from the ear head. The threshing element adopts the composite structure of short grain rod and plate teeth, the short grain rod is installed on the grain rod seat, the plate teeth are located on one side of the grain rod seat, and the concave plate adopts two combined structures of grid screen and punching screen, which can be realized with the threshing drum. Threshing and separation of crops. The short-grain rod-plate teeth composite elements are arranged on the closed cylinder of the threshing drum in a spiral manner; by changing the short-grain rods and plate teeth of different sizes, changing the position of the plate teeth, and adjusting the motion parameters, the device can adapt to rice and wheat. , rapeseed, soybean and other crops threshing and separation requirements. The invention has high depuration rate, less entrainment, low grain damage rate, light stalk breakage, less short stalks and miscellaneous residues in the shedding, uniform distribution along the axial direction of the threshing drum, and strong adaptability to the environment. After simple adjustment, it can adapt to the threshing requirements of various crops, the structure is simple, and the processing and manufacturing are convenient.