This invention relates to a device for threshing agricultural crops and in particular, this invention relates to a device for paddy field crop threshing and selecting operation device which can thresh, separate and select directly in paddy fields in agricultural grounds. More particularly, this present invention relates to a device for threshing agricultural crops which can rapidly and continuously feed large quantities of crops to the threshing and separating section of threshing and separating combine. Furthermore, this invention also relates to a device for threshing agricultural crops which has the beneficial effects of having high production efficiency, saving manpower cost, reducing labor intensity, and having safety and reliability in production.