The utility model relates to the technical field of continuous steel casting and specifically relates to a continuous casting assistant pouring plug. The continuous casting assistant pouring plug disclosed by the utility model is realized through the following technical scheme: the continuous casting assistant pouring plug is of an inverted cone, an open flow hole is upwards formed in the center of the bottom, the bottom of the assistant pouring plug is in contact with the upper plane of a filling pipe end of a seating brick, the conical inclined plane of the assistant pouring plug is in contact with the inner inclined plane of the seating brick and the inner inclined plane of a working layer of a tundish, and the upper plane of the assistant pouring plug is lower than the upper plane of the working layer of the tundish. The continuous casting assistant pouring plug disclosed by the utility is simple in structure and convenient to use, heat is generated by dissolving the assistant pouring plug made of heating alloy material with molten steel, alloy is dissolved in the molten steel for reducing the melting point, the molten steel can further melt a solid core layer of the assistant pouring plug, and then a fast pouring steel flow is formed, thereby ensuring the successful open flow at the normal temperature of the molten steel. The purposes of saving energy, reducing consumption and improving the quality of a package of continuously cast blanks by a continuous casting pouring head are further achieved.