Static mixer for liquid containing more than two ingredients

The invention provides a static mixer for liquid containing more than two ingredients, which relates to a small high pressure resistant tubular liquid static mixer which is formed by more than three groups of mixing units inside, and is particularly applicable to mixing of carbon dioxide composite foaming agent in production of carbon dioxide XPS polystyrene extruded sheet material. The static mixer comprises a tube body, a tight nut and mixing units; wherein the mixing units are arranged in the tube body; each mixing unit consists of two crossly distributed spiral flow deflectors, two obliquesplitters, two homogenization splitting tubesheet and a mixing neutral block in sequence; the spiral flow deflector is a slabbing spiral steel sheet; the oblique splitter consists of a plurality of metal sheets which have irregular surfaces which are bended by machine and packed together by thin steel wires; the homogenization splitting tubesheet is a round thin steel sheet, and a plurality of round through holes with th