Molding material mixing device for shoemaking

A forming material mixing device for shoemaking is applied to a first mixing material, a second mixing material and a plurality of elastic filling bodies and comprises a base, a bypass pipe, a secondary screw rod and a main screw rod. The base comprises an upper shell and a lower shell, the upper shell and the lower shell define a containing groove together, the upper shell is provided with a first feeding port and a second feeding port, the lower shell is provided with a third feeding port and a discharging port, the bypass pipe is arranged at the third feeding port, and the bypass pipe is arranged at the discharging port. The secondary screw rod can rotate and is arranged in the bypass pipe so as to stir the elastic filling body into the containing groove, and the main screw rod can rotate and is arranged in the containing groove so as to stir the elastic filling body with the first mixing material and the second mixing material which are placed from the upper shell; the forming material containing the mate