The invention discloses a gun control closed-loop system based on an Internet of Things platform. The system comprises a client, an application module, a gun taking module, a positioning and trackingmodule, a return module, an alarm module, a storehouse, guns, bullets and a cloud network. The gun taking module is connected with the application module, the return module is connected with the gun taking module, the return module and the positioning tracking module are both connected with the application module, the return module and the positioning tracking module are both connected with the alarm module, and the client, the application module, the gun taking module, the positioning tracking module and the return module are all connected with the cloud network. In the present invention, thegun is positioned and tracked in real time by adopting Internet of Things technologies such as GPS and RFID; meanwhile, the application module, the gun taking module, the positioning and tracking module and the return module form a closed-loop system, and the Internet of Things is combined with the closed-loop system, so that the guns used by police can be greatly standardized, the guns for police can be effectively managed and controlled, and the major potential safety hazards of the country and the society can be greatly reduced.