The invention discloses a livestock food smashing device with a protection function. The device comprises a rectangular base, wherein fixing mechanisms are arranged on the lower surface of the rectangular base, a strip-shaped fixing box is fixedly connected to the upper surface of the rectangular base, a protective feeding mechanism is arranged on the front surface of the strip-shaped fixing box, a cutting mechanism is arranged in the strip-shaped fixing box, clamping fixing mechanisms are arranged in the strip-shaped fixing box and located between the cutting mechanism and the protective feeding mechanism, a vibration collecting mechanism which is in lap joint with the cutting mechanism is arranged at the lower end of the rear side surface of the strip-shaped fixing box, and a controller is arranged on the side surface of the strip-shaped fixing box. The livestock food smashing device has the benefits as follows: the structure is simple and the practicability is high.