Method for preparing polybutadiene

Disclosed is a method for preparing polybutadiene that can improve productivity by minimizing the plugging effect, which occurs in the process of preparing polybutadiene, and increasing a conversion rate. The method for preparing polybutadiene comprises: a first polymerization step for feeding a raw material including butadiene, a polymerization catalyst, and a solvent into each of two first polymerization reactors arranged in parallel to each other so as to reduce the plugging effect and polymerizing the same to prepare a first polymerization solution containing a butadiene polymer, wherein gas generated by polymerization heat in the first polymerization reactors is discharged to a condenser; a second polymerization step for feeding the first polymerization solution into one or more second polymerization reactors arranged in series with the first polymerization reactors and polymerizing the same to prepare a second polymerization solution containing a butadiene polymer, wherein gas generated by polymerization heat in the second polymerization reactors is discharged to the condenser; and a step for discharging the second polymerization solution.