The invention relates to a super high temperature molten salt shaft seal pump. The super high temperature molten salt shaft seal pump comprises a pump body, a rotating shaft, a water power component,a heat shield device and a high temperature shaft seal, wherein a main flange serves as an installation seat of the pump body to be connected with a molten salt tank, a liquid outlet sleeve pipe communicates with a flow gathering ring cavity, an independent head pipe is arranged in the radial direction of the flow gathering ring cavity, the independent head pipe penetrates through the main flangeupwards to be outside the pump body, the rotating shaft is arranged inside the pump body and is driven by a motor, the water power component is connected with the rotating shaft and is used for leading molten salt into the liquid outlet sleeve pipe, the heat shield device is arranged on the rotating shaft in a sleeving manner and is arranged between the flow gathering ring cavity and the main flange, the high temperature shaft seal is arranged on the rotating shaft in a sleeving manner, is arranged on the flow gathering ring cavity and comprises a seal seat, an upper filling material and a lower filling material, and the upper filling material and the lower filling material are arranged at two ends of the seal seat correspondingly to form a seal air cavity between the seal seat and the rotating shaft. The super high temperature molten salt shaft seal pump is compact in structure, and long time continuous running under super high temperature working conditions with relatively strict seal requirements and large temperature cycle fluctuation can be realized.