Drainage rod for tundish casting device

The utility model discloses a drainage rod for a tundish casting device, which comprises a casting device main body, an opening seal, an upper nozzle, a lower nozzle, a drainage rod main body, a yellow end, a blue end and a flow blocking conical plug, the casting device main body is provided with the upper nozzle and the lower nozzle, and the drainage rod main body is placed in the upper nozzle. A yellow end is arranged at the upper end of the drainage rod body, a blue end is arranged at the lower end of the drainage rod body, and a flow blocking conical plug is placed at the bottom end of the blue end. According to the tundish casting device, the drainage rod main body is used before casting operation, so that the steel cylinder in the tundish casting device main body can be filled with the drainage sand, the tundish casting device main body is heated, and low-temperature molten plastic of the heated tundish casting device main body is molten; ladle filler sand in the steel drum flows into the gap space betw