The invention relates to a supported bis-silicon-bridged metallocene catalyst, a preparation method and application thereof. The catalyst consists of a bis-silicon-bridged metallocene compound, an alkyl aluminum compound or alkyl aluminum or a mixture of the alkyl aluminum compound and the alkyl aluminum, and an inert inorganic compound carrier, wherein a transitional metal of metal zirconium or titanium of the bis-silicon-bridged metallocene compound accounts for 0.45 to 0.70 percent of the 100 percent of the total weight; aluminum of the an alkyl aluminum compound or alkyl aluminum or a mixture of the alkyl aluminum compound and the alkyl aluminum accounts for 15 to 20 percents of 100 percent of the total weight; and the inert inorganic compound carrier accounts for the balance of the 100 percent of the total weight. The catalyst is used for all polymerization processes of ethylene or the ethylene and alpha-olefin with 3 to 20 carbon atoms (comprising the processes of gas phase polymerization, slurry polymerization and solution polymerization); the catalyst is used for the copolymerization of the ethylene or the ethylene and the alpha-olefin with 3 to 20 carbon atoms, the homopolymerization of the ethylene, or the copolymerization of the ethylene and alpha-olefin with 4 to 12 carbon atoms, the gas phase copolymerization of the ethylene and hexene-1, the slurry copolymerization of the ethylene and the hexene-1, and the solution polymerization process of the ethylene and octylene-1; and the alpha-olefin has higher contents in a copolymer.