Method for preparing multi-hollow zirconium oxide fiber by using cotton fiber

The invention discloses a method for preparing a multi-hollow zirconium oxide fiber by using a cotton fiber. The method comprises the following steps of using a natural cotton fiber as a template and a zircon-containing saline solution which mainly contains zirconium oxychloride as a dipping solution, through controlling a specific value between an additive tin tetrachloride and an active agent polyvinylpyrrolidone in the saline solution, adopting a soaking method, immersing the cotton fiber into the dipping solution, drying the cotton fiber, and sintering the cotton fiber at high temperature to prepare a multi-hollow zirconium oxide fiber material in which the structure of the cotton fiber is maintained. The method provided by the invention is simple and is further low-cost; the size and the pattern of a hollow fiber can be effectively controlled; prepared zirconium oxide fibers have the fiber morphology of cotton, and further, are mostly hollow-shape fibers; the prepared hollow zirconium oxide fiber materia