The invention discloses a novel static mixer and a mixing method which are used for rapidly and efficiently mixing two liquids. A fixing shaft is installed in a traditional Venturi static mixer, one or more guide impellers are installed on the fixing shaft in series, each guide impeller is formed by two or more guide blades, and the twisting directions of the guide blades on every two adjacent guide impellers are opposite. Perpendicular guide plates are additionally arranged on a reflecting tray, and the bending direction of the guide plates is opposite to the twisting direction of the guide blades on the guide impeller closest to the guide plates. Connecting plates installed in the radial direction are changed to be installed in the manner that a certain included angle is formed between the connecting plates and the radius, the included angle is 0-90 degrees, and the direction is opposite to the bending direction of the guide plates. According to the novel static mixer and the mixing method, the flow direction of liquids is repeatedly and rapidly changed in the Venturi static mixer, and thus two liquids can be rapidly and efficiently mixed.