Feed crushing device with sufficient crushing function

The utility model discloses a feed crushing device capable of fully crushing, which comprises a crushing box, a crushing device, a screening device and a conveying device are arranged on the crushing box, the crushing device comprises a pair of crushing rollers, the crushing rollers are arranged in an inner cavity of the crushing box, and a first motor is arranged on the crushing box; the screening device comprises a screening net, the screening net is arranged in an inner cavity of the crushing box, the screening net is obliquely arranged, and a discharging opening is formed in the side wall of the crushing box in a penetrating mode; the conveying device comprises a storage hopper and a spiral conveyor, the storage hopper is arranged on the side wall of the crushing box and communicated with the discharging port, a feeding port is further formed in the storage hopper, one end of the spiral conveyor is communicated with the storage hopper, and the other end of the spiral conveyor penetrates into an inner cavi