The invention discloses an automatic urban flood-control water drainage pollutant collection apparatus and method. The automatic urban flood-control water drainage pollutant collection apparatus comprises a spiral pollutant lifting pipe, a guide pipe, a pollutant collection pool, a pollutant blocking gate, a pollutant guide ring, a pollutant lifting pool, a water guide ring and a blade; the spiral pollutant lifting pipe comprises a pipe barrel, a spiral rod and a spiral vane; the upper part of the spiral pollutant lifting pipe is connected with the guide pipe, and an outlet of the guide pipe corresponds to the pollutant collection pool; the spiral rod extends out of the spiral pollutant lifting pipe and penetrates through the pollutant lifting pool, and three vanes are installed on the lower part; the upper part of the water guide ring is fixed on the wall of a rain well, the lower part of the water guide ring is closed up, and the bottom is aligned at the center of the vane; a vertical section of the water guide ring is an upward-concave shape, and the upper surface of the water guide ring is provided with a spiral water guide groove; and the pollutant blocking gate is fixed at the edge of an opening of the rain well, is of a stainless steel annular netted structure, and can intercept large-sized impurities such as branches and garbage; and pollutants and accumulated impurities can be collected while in water drainage, and a purpose of automatically discharging and filtering flood and pollutants and recycling sludge can be realized.