The invention discloses a transient power quality analysis system for electromechanical- electromagnetic transient hybrid simulation. The system comprises four parts, namely a database module, a transient power quality functional module, a computation result module, and a chart-module integration platform module, wherein the chart-module integration platform module is connected with the database module, the transient power quality functional module and the computation result module respectively, and the two-way data transmission is carried out. The system can be used for evaluating and analyzing the transient power quality in a simulating manner. The system has complete functions, provides a rich power quality model library, and can realize simulating computation on various transient power quality problems of voltage sag, voltage swell and the like.