Since the IoT based technologies were applied to various areas, people’s living has been more convenient and efficient. In present society, the number of one-person households is on the constant rise, and the industrial advancement causes their psychological alienation more. In the circumstance, a variety of methods to recover their psychological stability try to be found. More people regain their mental stability in the way of raising plants. Therefore, this study proposes the smart pot system using a USB plug-in sensor. In this study was implemented the smart pot system that is able to check a plant’s status on the basis of accurate data, such as plant growth information and environmental information, at any times and any places, to control and maintain the environment of growth, to monitor environmental information by setting and collecting automatically such data as temperature, humidity, solar radiation quantity, CO2, and growth conditions, to detect abnormal situations through human body monitoring and fire monitoring of indoor conditions, and to prevent dangerous circumstances. In the market, there are already home pot products to which IoT technology is applied. However, most of the smart pots fail to take into account species of plants and are recommended to be used for particular plants only. The proposed system is the USB plug-in based smart pot system capable of monitoring and controlling plant growth, supporting human relationship, and implementing user-customized functions by easily expanding sensors which are able to notice indoor emergency and disaster situations in everyday life. It also can add the function of meeting an emotional need by changing a LED color when people come close to their pet plants. The proposed system is expected to help many people growing plants easily realize plant growing conditions and indoor situations and improve their psychological stability.