An exhaust emission data processing system for inspecting automatically exhaust emission of the vehicle and wirelessly transmitting exhaust emission inspection data to a remote server is provided. The system includes an exhaust emission processing module, a wireless connection module, and a remote server. The exhaust emission processing module receives OBD data indicating the exhaust emission inspection data from an OBD system embedded in the vehicle via an OBD connector. The exhaust emission processing module creates an exhaust emission inspection package with the vehicle identification and the exhaust emission inspection data. The exhaust emission processing module transmits the package to the remote server for further diagnosis through the wireless connection module. The remote server sends the diagnosis reports back to the vehicle through the wireless connection module.