The invention discloses a villiaumite cooling ball bed high-temperature stack core flowing heat exchange simulating experiment system. The system can perform two experiments of Dowtherm A heat-conducting oil flowing and heat exchange and can simulate the flowing heat exchange characteristic of high-temperature villiaumite under the working condition of low temperature. The experiment system can perform flowing experiment and heat transfer experiment on high Prandtl number heat-conducting oil in a bed ball channel and can realize flowing and heat exchange simulation of the villiaumite cooling ball bed high-temperature stack core FLiBe; and the experiment system has the advantages of high safety, high experiment data precision, low operating cost and the like.