A kind of composite catalyst, it is used to by taking stimulants or coated in a kind of catalyst or a bag filter filtering material on a bag filter while remove PCBs (polychlorinated biphenyls) and dust, such as teflon, glass fibre or ceramics, provide a preparation method of composite catalyst. A kind of catalyst is a kind of Ti-A-B composite catalysts for removing PCBs (polychlorinated biphenyls) at low temperature, wherein A is selected from V, at least one V races metal of Nb and Ce and B is at least one Group VI metal selected from Cr, Mo and W. in Ti-A-B composite catalystsA weight ratio of the Ti of A and B is from 1: 1 to 1: 100, a: B from 10: 1 to 1: if two or more A metals are used, within a weight ratio of Ti-A-B composite catalysts, 10 ratio, weight ratios between a metals by weight are not limited to, if two or more B metals are used, within the weight ratio of Ti-A-B composite catalysts, the weight ratio between B metals is not limited to.
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