The invention discloses a cam roller type walnut horizontal-squeezing shell-breaking system. According to the technical scheme, the cam roller type walnut horizontal-squeezing shell-breaking system comprises a feeding device, a shell-breaking device and a falling device which are fixed to a rack, the feeding device is arranged above the shell-breaking device, and the falling device is arranged below the shell-breaking device; the feeding device comprises a feeding box, an intermittent feeding roller is arranged in the feeding box, a feeding baffle is mounted on one side of the intermittent feeding roller, an adjustable feeding scraper mechanism is mounted on the other side of the intermittent feeding roller, and feeding grooves spaced by 180 degrees are formed in the intermittent feeding roller; and the shell-breaking device comprises a squeezing box, a movable tooth-shaped squeezing plate and a fixed tooth-shaped squeezing plate are relatively mounted in the squeezing box, a squeezingcam is mounted on the side, away from the fixed tooth-shaped squeezing plate, of the movable tooth-shaped squeezing plate, and the movable tooth-shaped squeezing plate and the fixed tooth-shaped squeezing plate are each provided with a plurality of tooth gaps. Walnuts pass through the feeding device and then fall into the gaps of the movable tooth-shaped squeezing plate and the fixed tooth-shapedsqueezing plate, and the squeezing cam drives the movable tooth-shaped squeezing plate to conduct periodic reciprocating motion to be in synchronous fit with the fixed tooth-shaped squeezing plate toconduct squeezing shell-breaking on the walnuts.