Dynamic-static integrated mixer

The utility model discloses a dynamic-static integrated mixer for mixing polymer mother liquor and water in oil field's polymer injection with good mixing effect, high polymer viscosity retention rate, which comprises an outer pipe and a screw mechanism arranged in the outer pipe. The screw mechanism comprises a first helical blade and a second helical blade; the second helical blade and its mandrel is a one-body structure, the mandrel and the outer pipe are in permanent connection. The sense of the first helical blade is opposite to the sense of the second helical blade. Wherein the screw mechanism arranged in the outer pipe is single or multi-level structure. When using the dynamic-static integrated mixer, under the effect of the first helical blade and the second helical blade, polymer mother liquor and water are in the state of static and dynamic integrated rotating movement, which not only achieve a very good mixed effect, but also enhance the polymer viscosity retention rate, making an innovation in the mixing method of polymer mother liquor and water.