A silo de-bridging device, comprising: a rotary shaft for being rotatably supported in a silo and for being disposed in an axial direction of the silo, having an input end connected to a drive mechanism and driven by the drive mechanism to rotate; and at least one de-bridging unit connected to the rotary shaft; wherein each de-bridging unit comprising: a fixed sleeve fixedly sleeving on the rotary shaft and being driven by the rotary shaft to rotate; a movable sleeve moveably sleeving on the rotary shaft; and at least one de-bridging arm having one end connected to the movable sleeve, and the other end arranged for extending to a position close to an inner wall of the silo in a radial direction of the silo de-bridging device, characterised in that one of two end surfaces of the movable sleeve and the fixed sleeve adjoining each other is formed as an end surface cam contour, and the other is provided with an abutting member that abuts against the end surface cam contour; the end surface cam contour coordinates with the abutting member to constitute an end surface cam structure, so that the movable sleeve is moveable to and fro in the axial direction of the silo when the fixed sleeve and the movable sleeve rotate relative to each other. a rotary shaft for being rotatably supported in a silo and for being disposed in an axial direction of the silo, having an input end connected to a drive mechanism and driven by the drive mechanism to rotate; and at least one de-bridging unit connected to the rotary shaft; wherein each de-bridging unit comprising: a fixed sleeve fixedly sleeving on the rotary shaft and being driven by the rotary shaft to rotate; a movable sleeve moveably sleeving on the rotary shaft; and at least one de-bridging arm having one end connected to the movable sleeve, and the other end arranged for extending to a position close to an inner wall of the silo in a radial direction of the silo de-bridging device, characterised in that one of two end surfaces of the movable sleeve and the fixed sleeve adjoining each other is formed as an end surface cam contour, and the other is provided with an abutting member that abuts against the end surface cam contour; the end surface cam contour coordinates with the abutting member to constitute an end surface cam structure, so that the movable sleeve is moveable to and fro in the axial direction of the silo when the fixed sleeve and the movable sleeve rotate relative to each other. a fixed sleeve fixedly sleeving on the rotary shaft and being driven by the rotary shaft to rotate; a movable sleeve moveably sleeving on the rotary shaft; and at least one de-bridging arm having one end connected to the movable sleeve, and the other end arranged for extending to a position close to an inner wall of the silo in a radial direction of the silo de-bridging device, characterised in that one of two end surfaces of the movable sleeve and the fixed sleeve adjoining each other is formed as an end surface cam contour, and the other is provided with an abutting member that abuts against the end surface cam contour; the end surface cam contour coordinates with the abutting member to constitute an end surface cam structure, so that the movable sleeve is moveable to and fro in the axial direction of the silo when the fixed sleeve and the movable sleeve rotate relative to each other.