The invention relates to a water treatment device, and in particular relates to an integrated high-efficiency water treatment reactor. The integrated high-efficiency water treatment reactor comprises a housing, and a water inlet and a water outlet both formed in the wall of the housing, wherein the housing is internally provided with a coalescent pack area, a catalytic oxidation reagent feeding opening arranged above the coalescent pack area and a flocculation reaction chamber arranged under the coalescent pack area; the flocculation reaction chamber is provided with a flocculant inlet; a waste water channel surrounding the coalescent pack area is arranged between the housing and the coalescent pack area; an inclined-tube settling basin is arranged under the flocculation reaction chamber; and a sludge discharge hole is formed in the bottom of the inclined-tube settling basin. The integrated high-efficiency water treatment reactor is simple in equipment, mild in reaction conditions, convenient to operate and stable in treatment effect.