The invention discloses a small animal detecting and repelling system. The system comprises an early-stage data acquisition device, a small animal prevention and control device, a wireless transmission module and a central server, wherein the early-stage data acquisition device and the small animal prevention and treatment device are connected with the central server through the wireless transmission module, the early-stage data acquisition device transmits the acquired data to the central server through the wireless transmission module after detecting the activity condition of a small animal,the central server adjusts the working state of the small animal prevention and control device according to the data, and the small animal prevention and control device realizes the active defense. The small animal detecting and repelling system provided by the invention is good in continuous effect.