Model ZY20(202-3) screw oil pre-press is a continuous oil expeller which is suitable for preliminaly pressing- solvent extracting press or twice pressing process in small and medium- sized oil plant, and used to handle with oil seeds such as rapeseed, peanut, sunflower, and cottonseed kernels. It has the following advantages: high processing ability: low power consumption; low operation expense; defatted cake being loose but not crushed, easy to sovent penetration; low residual oil rate.