Polylactic acid modified material preparation device

The utility model relates to the technical field of polylactic acid modified material processing, in particular to a polylactic acid modified material preparation device which comprises a drying preparation box body and a feeding pipe installed on the top of the drying preparation box body, an air heater is fixedly installed at the bottom of the drying preparation box body, a discharging port is formed in one side of the drying preparation box body, and a screening mechanism is arranged on the feeding pipe. The screening mechanism comprises a treatment box fixedly installed at the top of the feeding pipe, a feeding pipe is installed at the top of the treatment box, a multi-stage screen is obliquely installed in the treatment box, a first discharging opening formed in the treatment box is formed in one side of the multi-stage screen, a guide plate is obliquely installed at the bottom of the multi-stage screen, and a second discharging opening is formed in one side of the treatment box. And a baffle is movably