As many potted plants are placed at long distances from each other in public areas, watering them leads to much manpower consumption, while using large-scale irrigation in this situation is unsuitable. Since plants are relatively stationary, its appropriate to use robots to water them, instead of human labor. To make watering indoor plants easier, in this article, an Arduino-based wheeled robot for plant-watering in public places is designed. 3D modeling, circuit design, programming and verification experiments have been conducted to complete this design. The achievement includes a 3D model, a control circuit, an executive system and Arduino code. In this research, the cost issue has been taken into consideration. The designed robot is relatively economical, as it only uses some basic inexpensive components. The robot has the capacity to realize route-tracking for navigation, detect the plant right before it and spray water accurately, with various sensors. The existing design can achieve predetermined goals at present, and improvements are going to be undertaken in the future.