The invention discloses a method for producing a thin plate for a pure nickel plate heat exchanger plate. The method comprises the steps that electrolytic nickel and additives are compounded accordingto the corresponding weight parts; the additives comprise graphite, pure titanium and a nickel-magnesium alloy; the vacuum degree and the smelting value of a vacuum reactor are set, the electrolyticnickel, graphite and pure titanium are melted and refined by a vacuum induction furnace, and then the nickel-magnesium alloy is added in an argon atmosphere; all the materials are melted in the vacuuminduction furnace, then pouring is carried out, and a first pure nickel ingot is obtained; riser cutoff is performed on the first pure nickel ingot, planing, milling and grinding are performed on thesurface of the first pure nickel ingot, and a second pure nickel ingot is obtained; the second pure nickel ingot is separately subjected to hot rolling and cold rolling, and the thin plate for the semi-finished pure nickel plate heat exchanger plate is obtained; and the thin plate for the semi-finished pure nickel plate heat exchanger plate is vacuum annealed, and the thin plate for the second pure nickel plate heat exchanger plate is obtained. By the adoption of the method, the thin plate has small anisotropy, high toughness and good punching performance.