The invention provides a titaniferous
solid catalyst component used for vinyl
polymerization and a preparation method. The titaniferous
solid catalyst component is prepared according to the following three continuous steps: 1) under the existence of
halogen or
halogen-containing compound, reacting
metal magnesium with
alcohol, thereby preparing a
magnesium-containing
solid; 2) utilizing an organic metallic compound or a mixture of the organic metallic compound and an
electron donor compound to process the
magnesium-containing solid, thereby obtaining a magnesium-containing catalyst carrier; and 3) under the existence of an
inert organic solvent, utilizing a compound of
transition metal titanium to process the magnesium-containing catalyst carrier, and then utilizing a
halogenated alcohol compound to process, thereby obtaining the catalyst component. The preparation method has the characteristics of simple process, convenience in operation, low investment in
industrial equipment, easiness in controlling the product quality, and the like. The titaniferous solid catalyst component has the characteristics of high vinyl
polymerization catalytic activity, high copolymerizing capacity, high stacking density of
polymer, less
subdivision, and the like. The titaniferous solid catalyst component is suitable for
slurry polymerization or gas-phase polymerization of vinyl, and is especiallysuitable for a gas-phase
fluidized bed polymerization process for the vinyl, in which the catalyst is fed in a
slurry form.