The invention relates to a prefabrication method for a tubular sodium-chloride battery positive electrode. The prefabrication method comprises the following steps of (1) matching positive electrode active materials Ni and NaCl, an additive and a second phase electrolyte NaAlCl<4> of the sodium-chloride battery in a drying environment based on certain mass percentage, and putting the mixture into a sealed ball milling tank to be subjected to ball milling and uniform mixing to obtain a uniformly-mixed positive electrode material; and (2) putting the uniformly-mixed positive electrode material and a positive electrode current collector into a flexile tube which is matched with the shape of a beta-Al<2>O<3> electrolyte ceramic tube in a drying environment, after sealing and then performing isostatic compaction under a certain pressure condition. By virtue of the prefabrication method, a fusion process of the NaAlCl<4> and a vacuum injection process are avoided; instead, addition of the positive electrode active materials Ni and NaCl and injection of the second phase electrolyte NaAlCl<4> are performed in one step, so that a heating fusion system of the NaAlCl<4> and a complex vacuum electrolyte injection system are not required; and therefore, the technological process is simplified and batch production can be realized easily.