The invention concerns about a method for the synthesis of a long－fiber manganese oxide octahedral molecular sieve, which is primarily based on flux method to obtain it. The initiator for the synthesis is birnessite and the flux is NaCl. The mixture, birnessite and NaCl after being well mixed up, is put into the aluminum oxide crucible and heated. When the reaction is finished, the product suspends by adding water and then is filtered. After being filtered, a self－supporting film is formed. Such a film is a long－fiber manganese oxide octahedral molecular sieve which, having the character of self－supporting, is able to improve the convenience for the application of catalyst and absorbing heavy metals.
