The utility model relates to a prefabricated member for an iron runner working lining slag-iron intersection. According to the wholly poured prefabricated member, two intersected U-shaped grooves are arranged in the prefabricated member and are intersected and communicated with each other, two intersected wedge-shaped bodies are arranged outside the prefabricated member, and a section of the lower portion of the junction position of the prefabricated member and the outside extends out to connect with transition platforms. According to the prefabricated member, at the slag-iron intersection which is difficult to construct and maintain, the wholly poured prefabricated member is used for replacing traditional castable working linings and permanent layers. The wholly poured prefabricated member is efficient, practical and convenient to construct, repair and change.