The invention discloses a pure nickel palladium plating high-temperature electric conduction wire. The pure nickel palladium plating high-temperature electric conduction wire is composed of a nickel core with pure nickel as the main component and a palladium plating layer with the surface thickness ranging from 1 micrometer to 3 micrometers. An improver for improving the stability and binding force of the plating layer is added into the pure nickel core. By weight part per million of tiny metal elements in the improver and the main component nickel, calcium ranges from 8 ppm to 20 ppm, lanthanum ranges from 10 ppm to 35 ppm, magnesium ranges from 10 ppm to 25 ppm, cerium ranges from 10 ppm to 40 ppm, aluminum ranges from 8 ppm to 20 ppm, chromium ranges from 30 ppm to 50 ppm, and tin ranges from 10 ppm to 30 ppm. The invention further discloses a preparation method of the pure nickel palladium plating high-temperature electric conduction wire. Compared with the prior art, the pure nickel palladium plating high-temperature electric conduction wire has the beneficial effects that the cost of palladium plating nickel wires is lower than that of gold plating nickel wires, meanwhile, the nickel wires have good stability and mechanical performance compared with copper wires, the binding force between the nickel core and the palladium plating layer is higher than the binding capacitybetween a copper core and a gold plating layer, and therefore the pure nickel palladium plating high-temperature electric conduction wire effectively avoids plating missing or falling in the manufacturing process, the use performance is more reliable, and the service life is longer.