With the development of computer multimedia, visual analytic system goes beyond the traditional screen-mouse-keyboard. Digital sandbox projection system has attracted more and more attention in recent years. In the context of smart campus, this work proposes an interactive campus digital sandbox, that supports multi-user cooperation and multi-item interaction by constructing a visual analytic pipeline of sensor input, intelligent computing terminal, visual output driven by deep learning. Taking the heatmap simulation of campus activities as an application scenario, the feasibility of the system is verified.