The invention discloses a subway train operation service quality detection apparatus and a method thereof. The apparatus comprises a detection unit, a detection host and a processing unit, wherein the detection unit includes an inertial measurement module and the detection unit is used for collecting a train body operation attitude parameter, a noise in a carriage, a temperature, humidity, air quality and a mobile phone signal intensity; the detection host is connected to the detection unit in a communication connection mode and is used for acquiring data collected by the detection unit; and the processing unit is connected to the detection host in the communication connection mode, and is used for receiving and storing data transmitted by the detection host, calculating a position parameter of a subway line where the detection apparatus is located according to the data, carrying out single index and integration index evaluation on subway train operation service quality, and carrying out data contrast analysis, data trend analysis, space position analysis, line equipment association analysis and subway line track disease analysis. In the invention, space positioning precision of subway train operation service quality analysis evaluation and objectivity of an analysis result are increased, and a convenient technology means is provided for subway train service quality management and monitoring.