The invention relates to a dedusting and denitration integrated catalyst used for the 
smoke-gas treatment and a preparation method of the dedusting and denitration integrated catalyst, and belongs tothe technical field of catalysts. The method comprises five processes of mixing, extruding, 
drying, blocking a hole and calcining. The method changes the states of various through holes in a traditional 
honeycomb type SCR catalyst through the blocking technique, the 
smoke gas enters from an inlet end of the 
honeycomb type catalyst, and passes through the side wall of an adjacent hole of an unclosed hole on the inlet end, the 
smoke gas is fully filtered through the side wall, and the smoke dust is removed. Therefore, the purpose of dedusting is fulfilled, the 
retention time of the smoke gas inthe catalyst is also prolonged, the contact area between the smoke gas and the catalyst is increased, the efficiency of the catalyst is improved, meanwhile, the variety and the use level of a pore forming material are limited, the pore size distribution on the side wall in the integrated catalyst is changed, so that the catalyst is suitable for removing the dusts at various particle sizes, the purpose of simultaneously denitrating and dedusting is fulfilled finally, the integration of denitrating and dedusting is realized in the real sense, and the operation costs for smoke-gas treatment and investment in 
environmental protection are greatly reduced in a power 
plant and an 
industrial furnace.