This invention discloses a hightemperature and high pressure heat exchange system for the highacid spent electrolyte, incl. spiralplate heat exchanger made of 904L stainless steel plate or Ti material with plate thickness up to 4mm5mm; an inlet on one side of the spiralplate heat exchanger is connected through booster pump to the spent electrolyte storage tank, while the inlet on the other side is connected to the stream supply unit to realize the hightemperature and highpressure heat exchange for the highacid spent electrolyte.