The invention discloses a green feed smashing device, and relates to the technical field of green feed processing. The green feed smashing device comprises a smashing barrel, a feeding opening is formed in the top of the smashing barrel, a motor supporting seat is fixedly connected to the center of the top of the smashing barrel, a driving motor is fixedly connected to the top of the motor supporting seat, and a driving shaft of the driving motor penetrates through the motor supporting seat and is fixedly connected with a rotating shaft. The end, away from the driving motor, of the rotating shaft extends into the smashing barrel and is fixedly connected with a smashing device, and the part, corresponding to the smashing device, of the inner wall of the smashing barrel is fixedly connected with a limiting device. According to the green feed smashing device, the cutting effect is better, the sliding condition is avoided, the swing amplitude of green feed is small, the size of the smashed green feed is closer, deviation of the rotating track of a cutting knife body is avoided, using is safer and more reliable, maintenance operation is more convenient, and the cutting knife can be protected.