NOVELTY - Catalyst prepared by introducing e.g. vanadium(V), lead(IV), manganese(IV), germanium(IV), silicon(IV), bismuth(III), lanthanide(III), terbium(III), praseodymium(III), cesium(III), cobalt(III), copper(II), cadmium(II), iron(II), calcium(II), magnesium(II), zinc(II), barium(II) and/or strontium(II) metal ions into cyclodextrin compound (matrix) to form a complex, and drying at room temperature or below 80 degrees C or in vacuum to obtain cyclodextrin compound-monometallic complexes, cyclodextrin compound-bimetallic complex or cyclodextrin compound-polymetallic complexes, is claimed.    USE - The catalyst is useful in conversion of animal and plant crude oil into biodiesel by transesterification (claimed).    ADVANTAGE - The catalyst: has good stability and resistance to water and simple preparation method, is easy to recover, and can be reutilized when compared with the existing catalyst; simplifies biodiesel preparation, reduces its production costs and saves energy; and widens the research field of cyclodextrin compound.    DETAILED DESCRIPTION - Catalyst prepared by introducing vanadium(V), tin(IV), lead(IV), manganese(IV), germanium(IV), vanadium(IV), silicon(IV), manganese(III), bismuth(III), lanthanide(III), terbium(III), praseodymium(III), cesium(III), cobalt(III), copper(II), lead(II), cadmium(II), manganese(II), iron(II), calcium(II), magnesium(II), zinc(II), barium(II) and/or strontium(II) metal ions into cyclodextrin compound(matrix) to form a complex, and drying at room temperature or below 80 degrees C or in vacuum to obtain cyclodextrin compound-monometallic complexes, cyclodextrin compound-bimetallic complex or cyclodextrin compound-polymetallic complexes, is claimed. The cyclodextrin compound is cyclodextrin ( alpha -( cyclodextrin), ( beta -( cyclodextrin) or ( gamma -( cyclodextrin)) or its derivatives. INDEPENDENT CLAIMS are also included for:    (1) preparing the catalyst, comprising mixing cyclodextrin, inorganic base, surfactant and deionized water in a mass ratio of (10-15):10:(20-25):(500-700), slowly adding metal salts of vanadium(V), tin(IV), lead(IV), manganese(IV), germanium(IV), vanadium(IV), silicon(IV), manganese(III), bismuth(III), lanthanide(III), terbium(III), praseodymium(III), cesium(III), cobalt(III), copper(II), lead(II), cadmium(II), manganese(II), iron(II), calcium(II), magnesium(II), zinc(II), barium(II) and/or strontium(II), where the mass ratio of metal salt and cyclodextrin is (1-6):1, stirring for 2-15 hours, filtering, adding absolute ethyl alcohol to the filtrate, precipitating completely, filtering, collecting precipitate, and drying at normal temperature or below 80oC or in vacuum to obtain the catalyst, where the inorganic base is sodium hydroxide and the surfactant is sodium hexadecyl bromide; and    (2) use of catalyst for conversion of animal and plant crude oil into biodiesel by transesterification comprising adding absolute methanol or absolute ethyl alcohol into the animal and vegetable oils, where the ratio of alcohol to oil is (10-50):1, then adding metal complexes of cyclodextrin compound, heating to react at 50-85 degrees C for 1-48 hours, filtering or centrifuging to separate the catalyst from the product, where the regenerated catalyst can be reused and the amount of catalyst is 0.2-10% of the wt. of animal and plant oil, adding petroleum ether for three times (5-15 ml for each time) to elute out the catalyst attached to methyl ester, and vacuum distilling methyl ester of petroleum ether solution at 80 degrees C to obtain the biodiesel.