A screw mixer comprises a housing, a mixing device, a loading and an unloading devices. The mixing device is made in the form of helical screws rotating in one direction, wherein mixing screws have larger pitch of a helical surface and the working area of these screws has one pitch fewer than the conveying screw. The screw pitches are related by dependencies;, where- pitches of the conveying and mixing screws respectively;- number of pitchesin the working area of the conveying screw, and the helical surfaces of mixing screw have holes, whose diameter decreases from the center of spiral surface to the periphery thereof.
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