The invention discloses a flow deflector mold for a silent check valve. The flow deflector mold comprises a flow deflector mold body and a flow deflector casting riser, wherein the flow deflector mold body is provided with an upper box body and a lower box body which are connected movably; an upper box sand mold and a lower box sand mold are arranged in the upper box body and the lower box body respectively; dry core bodies A are arranged at one end in the upper box sand mold and one end in the lower box sand mold; dry core bodies B which are matched with the dry core bodies A are arranged at the other ends of the upper box sand mold and the lower box sand mold; annular channels are formed at one end of the dry core bodies B which is away from the dry core bodies A; at least three wedged channels are formed between the annular channels formed in the dry core bodies B and the inner walls of the dry core bodies B. By adopting the flow deflector mold, a flow deflector casting of the silent check valve is cast in a way of parting two boxes, so that the phenomenon of fin defect caused by the flow deflector casting of the silent check valve is avoided, and the size accuracy in a height direction is increased; a flow deflector casting mold of the silent check valve is lowered in the manufacturing difficulty, is shortened in the mold manufacturing period, has a high production rate, and can be suitable for producing sand mold frames, horizontal lines and vertical lines.