The invention discloses a method and a device for growing crystalline silicone by the aid of forced convection. The method and the device have the advantages that forced convection is directly introduced into silicon melt by means of mechanical stirring in polycrystalline silicon ingot casting procedures, the horizontal temperature gradient of the silicon melt can be lowered, impurity discharge effects with segregation functions can be realized, and an impeller and support shafts which are used for stirring the silicon melt are made of silicon nitride; the silicon nitride impeller can be lowered in crystal growth procedures, so that the growth rate of crystals can be measured on the basis that the silicon melt is not polluted, and accordingly follow-up crystal growth conditions can be improved; the rotational speed of the impeller and the height from the impeller to the crystals are adjusted along with continuous growth of the crystals, and accordingly stable convection of the silicon melt above the crystals can be maintained.