The invention relates to a pure-nickel tube for a chemical equipment falling film and a preparation method of the pure-nickel tube, and belongs to the field of nickel-chromium smelting and common nonferrous metal rolling. The pure-nickel tube is prepared from, by mass percentage, larger than or equal to 99.0% of Ni+Co and 0.05%-0.60% of Ti in the formula, wherein impurity elements are controlled to the situation that the percentage of Cu is smaller than or equal to 0.015%, the percentage of Si is smaller than or equal to 0.03% of Si, the percentage of Mn is smaller than or equal to 0.002%, andthe percentage of Mg is smaller than or equal to 0.01%. The pure-nickel tube is prepared through vacuum melting, electroslag remelting, forging, cross piercing, tube blank coping, combined rolling, inner hole coping and annealing. By the adoption of the formula and the process, the harmful impurity elements such as C, S and P of the pure-nickel tube for the falling film can be effectively controlled within a low limit, meanwhile, Ti is added, the strength of the nickel tube is enhanced, and the deformation resistance of the nickel tube under the working environment condition is greatly improved. Through control over the components and the machining process, the yield of products is increased, the production cost is reduced, the content of inclusions and other harmful matter is reduced, the strength and the extension property are obviously improved, and the service life of the nickel tube during use is prolonged.