The utility model relates to an animal cultivation techniques field especially relates to a prevent that sow from killing alarm system of piglet, including the alert feelings ware of acoustic processing, warning light and induction system, induction system includes microphone and infrared ray sensor, the microphone with infrared ray sensor respectively with the alert feelings ware electricity of acoustic processing is connected, infrared ray sensor locates the upper portion of swinery for the state of response sow, the lower part of swinery is located to the microphone for gather the sound sound signal interior with the record swinery, the alert feelings ware of acoustic processing is used for the switching according to the state control microphone of sow to sound sound signal to in the swinery handles and judges whether the piglet is pressed, the warning light with the alert feelings ware electricity of acoustic processing is connected, is used for receiving the control signal transmission alarm of the alert feelings ware of acoustic processing. This alarm system simple structure, convenient operation, the possibility that the piglet was killed has been reduced.