The invention discloses a flow guiding sand filling structure for a refined steel ladle and a sand adding technology. The refined steel ladle comprises an upper nozzle and a lower nozzle which are located at the bottom of the refined steel ladle and are in butt joint with each other through a sliding plate mechanism, the periphery of the upper nozzle is provided with a nozzle brick cup, and the nozzle brick cup is provided with an inner hole communicated with the upper nozzle. The flow guiding filling structure comprises first flow guiding sand and second flow guiding sand which fill the innerholes of the upper nozzle and the nozzle brick cups from bottom to top in the using state, wherein the sintering temperature of the first flow guiding sand is 1,500 DEG C, and the sintering temperature of the second flow guiding sand is 1,450-1,500 DEG C. According to the flow guiding sand filling structure and the sand adding technology, the self-open rate when molten steel is poured can be significantly increased, the quality of refined molten steel is effectively guaranteed, and safe and smooth proceeding of the continuous casting technology is effectively guaranteed.