Continuous polymerization process for producing polylactic acid slices from lactide

The invention discloses a continuous polymerization process for producing polylactic acid slices from lactide. The continuous polymerization process comprises the following steps: lactide in a lactide workshop and a devolatilization reactor enters a lactide buffer tank through a lactide pipeline; one part of lactide circulates to the lactide buffer tank, and the other part of lactide enters the lactide preheater; the lactide and the three catalysts enter a static mixer to be fully mixed; after mixing is completed, the mixture enters a lactide prepolymerization reactor to be subjected to ring-opening polymerization; conveying the mixture to a lactide polymerization system, and carrying out polymerization reaction to generate a melt; one part of the melt output from the polymerization system is circulated to the tubular reactor, and the other part of the melt is conveyed to the devolatilization reactor for devolatilization; and mixing the melt after devolatilization with a modified additive, and conveying the m