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In order to solve the problem of pet lost and difficult to retrieve, a design of pet anti lost wearable device based on Internet of Things technology is proposed.In the short distance of the system, through the low-power Bluetooth 4.2 module, the WeChat applet of mobile phone can control and play the music of wearable device and light up the colorful led to prompt the pet′s position. At the same time, with the help of the speech recognition module, the wake-up system can be used, and the user can also complete the above operations by saying the secondary keywords.Outside the Bluetooth signal range, the user can check the location and speed information collected by the GPS + GPRS location module on the pet wearable device in the WeChat applet. The experimental results show that the system has perfect functions, the Bluetooth control distance of WeChat small program end reaches 80 m, the GPS positioning accuracy error of wearable device is controlled within 2 m, and the voice recognition function is stable, which can help the owner to find and control the pet in time，and avoid the potential safety hazard and property loss caused by pet loss.