Polylactic acid polymerization reaction apparatus and system

A polylactic acid polymerization reaction apparatus, comprising a polymerization reactor (10) and an agitating assembly (20) arranged in a flow channel of the polymerization reactor (10), wherein the agitating assembly (20) comprises an electromagnetic winding mechanism and a magnetic induction element (21), the electromagnetic winding mechanism is arranged along the inner wall of the polymerization reactor (10) around the magnetic induction element (21), with clearance formed between the electromagnetic winding mechanism and the magnetic induction element (21), so that the magnetic induction element (21) and the electromagnetic winding mechanism are able to induce electromagnetic induction, and thereby the magnetic induction element (21) is rotatable around its own axis;

• a threaded groove is formed on the magnetic induction element (21),
• the polylactic acid polymerization reaction apparatus further comprises a circulation pipe (31) and a static mixer (32) and a circulation pump (33) that are arranged on the circulation pipe (31), wherein two ends of the circulation pipe (31) are respectively in fluid communication with the portions of the polymerization reactor (10) at the two sides of the agitating assembly (20).