Planet screw type machine

The utility model discloses a planet screw type machine. The machine comprises a main case, a central sun wheel and at least one planet screw, wherein the main case consists of a cylinder body and end covers connected to the two ends of the cylinder body; the inner wall of the cylinder body is divided into a left part and a right part; a group of multi-head inner threads is arranged on each of the two parts; the spiral directions of the two groups of inner threads are opposite; the central sun wheel comprises a cylinder body and a central rotating shaft which is arranged on the main case by virtue of a bearing; at least one planet screw is eccentrically arranged in the central sun wheel and is connected with the inner threads of the main case in an engaged mode; two groups of single-head or multi-head outer threads are respectively arranged on the left part and the right part of the planet screw; the spiral directions of the two groups of outer threads are opposite and the outer threads are connected with the