PURPOSE: To provide an inorganic support catalyst for preparation of ethylidene diacetate to facilitate to separate ethylidene diacetate product therefrom and preparation of the catalyst and preparation of ethylidene diacetate using it.

CONSTITUTION: The catalyst is expressed by a general formula; MaS where M is a compound selected from RhCl3.xH2O and RhCl(CO) [P(C6H5)3]2; S is the inorganic support selected from γ-alumina, activated carbon, silica, TiO2 MgO and ZnO; (a) is a weight ratio of a metal in the catalyst. The catalyst is prepared by adding M and S into distillated water, followed by heating at 50-100°C, followed by precipitating, and followed by drying at 90-150°C. By reacting methyl acetate, iodomethane, carbon monoxide and hydrogen in the presence of a promoter at 90-250°C and at 20-70 atm, ethylidene diacetate is prepared.