The utility model relates to a cold feed extruder screw used in the processing field of rubber, plastic and chemical fabric, namely, an extruder throttling edge screw. The utility model is improved on the basis of the present major-minor thread screw, the pin conveyance screw, etc. Even numbers of thread grooves are arranged in the fluxing zone, and a plurality of equidistant throttling edges are arranged in each thread groove. Each thread edge is split into a high edge segment and a low edge segment. The low edge is lower than the high edge in certain distance to guarantee the split stream and the shearing of materials. The height of the throttling edge is same with the height of the low edge, and the connection point between the throttling edge and the low edge forms an arcuation shape for the split stream and the amalgamation of the materials. The utility model has the advantages of novel structure, simple processing, convenient maintenance, adequate amalgamation quality.