In this study, developed integrated soil health monitoring system using the Internet of Things (IoT) for evaluating soil health which is irrigated by the effluent from Sewage Treatment Plant (STP). The system makes use of sensors to gather information on different characteristics like pH levels, temperature, soil moisture and NPK. The microcontroller unit receives the collected data and using pre-programmed threshold values activates the integrated system. A cloud-based platform for data processing and storage is also part of the system. The proposed system may be able to handle issues like the necessity for regular monitoring and the fluctuation of effluent quality that are related to using STP effluent for irrigation. The technology makes irrigation precise and effective, which promotes healthy plant development and healthy soil conservation.