The invention discloses a modeling method and a system for correcting and predicting an arc extinguishing angle. The modeling method includes the following steps: firstly constructing a main circuit of a direct current system in simulation software power system computer aided design/electromagnetic transients including DC (PSCAD/EMTDC), and establishing a control model in an inversion side control circuit by adopting the modeling method for correcting and predicting the arc extinguishing angle. The modeling method is verified by adopting a yingdong +-660kV direct current system model, and results show correctness of the modeling method. The modeling method and the system for correcting and predicting the arc extinguishing angle can solve the problem that the arc extinguishing angle cannot be measured actually, and guarantees that an inversion side control curve is a positive slope curve. The modeling method is simple and practical, can well simulate and study dynamic property service of the direct current system, and is an essential condition for detailed modeling of the direct current system which cannot measure the arc extinguishing angle actually.