This thesis is to design a hardware realizing environmental pollution source traceability mobile device, using Arduino UNO R3 platform as the control core, equipping with Arduino Sensor Shield V5.0 sensor expansion board to extend the function, and using MQ- 137 ammonia sensing module and ESP8266 WIFI transceiver wireless module as a module to detect pollution sources and to implement the remote control. The mobile device detects the concentration of ammonia in the environment by the sensor module, and after the calculation of the ammonia concentration ratio, the mobile device will move towrd the area with the highest ratio of ammonia concentration which is under detected. In addition, all the monitoring data and the moving directions will be transmitted to the cloud based on ESP8266 WIFI transceiver module on the mobile device through the WIFI Router. With their mobile phone WIFI, the users can control the mobile device, monitor the detecting data and also the moving directions after the calculation of ammonia concentration ratio. At the end of this thesis, there will come out with a Boost module which can be applied to the normal power bank in the market. By boosting the output with the Boost module, the power bank will be able to replace the 18650 battery, which is usually used on the mobile device, to longer the using time of the mobile device.