The invention relates to a method and system of intelligent device discovery in a local area network. The method comprises the following steps: intelligent device information registration, intelligent device information storage, intelligent device query and intelligent device list acquisition; the system comprises an intelligent device, a router, and a control terminal; The router is configured to receive the message sent by the intelligent device and store the form of the intelligent device, and the control device is configured to receive the information sent by the intelligent device and restore the intelligent device list and communicate with the intelligent device. The method enables the mobile terminal to obtain intelligent device information more quickly, increases the reliability of the device discovery, and makes the mobile application more lightweight and increases the robustness of the application.