The utility model discloses a mulling device is used in casting processing, including working bin and ji wucang, the working bin lies in ji wucang's top, the lower extreme of working bin is equipped with the discharge gate, and working bin and ji wucang pass through the discharge gate intercommunication, install mulling stirring piece in the working bin, mulling stirring piece is including electronic pivot, first mulling piece installed part and second mulling piece installed part are installed respectively to the upper and lower both ends of electronic pivot, and install the mulling piece between first mulling piece installed part and the second mulling piece installed part, evenly install the electro -magnet on the lateral wall of mulling piece. The utility model discloses simple structure, design benefit, convenient to use through designing curl and cylindric respectively with mulling piece and working bin, can make the effect of mulling better, place the electro -magnet in spiral helicine mulling piece in addition on, select the mulling piece whether to draw metallic impurity as required to only need take out the clearance with the mulling piece when wasing.