An adjustable artificial chordae tendineae fixing assembly, comprising: an occlusion device, and an adjusting rod; wherein the occlusion device comprises a first occlusion disc, a waist portion and a second occlusion disc; a middle of the first occlusion disc, a middle of the waist portion and a middle of the second occlusion disc of the occlusion device form a penetrating passage allowing an artificial chordae tendineae to pass through; a switch adjusting device is arranged at an opening of the penetrating passage in the first occlusion disc; characterized in that a protruding portion on an outer side of the switch adjusting device is arranged outside the first occlusion disc; a valve and a plurality of friction plates on an inner side of the switch adjusting device extend inside the opening of the penetrating passage; the plurality of friction plates are connected to the valve, and a number of the plurality of friction plates is at least two; the plurality of friction plates are controlled to be opened or closed by rotating the valve, to control the penetrating passage to be opened or closed; the occlusion device is an elastic mesh structure configured to produce an elastic deformation; and the adjusting rod is a hollow rod-shaped structure allowing the artificial chordae tendineae to pass through; two clamping jaws are arranged at a head of the adjusting rod; the two clamping jaws are connected to a handle at a tail of the adjusting rod by a spring; the two clamping jaws are controlled to be opened and closed by pressing the handle at the tail of the adjusting rod; the two clamping jaws are configured to be clamped on the protruding portion of the switch adjusting device to be connected to the occlusion device and wherein, when the adjusting rod is connected with occlusion device, the valve of the switch adjusting device is configured to rotate by rotating the adjusting rod. an occlusion device, and an adjusting rod; wherein the occlusion device comprises a first occlusion disc, a waist portion and a second occlusion disc; a middle of the first occlusion disc, a middle of the waist portion and a middle of the second occlusion disc of the occlusion device form a penetrating passage allowing an artificial chordae tendineae to pass through; a switch adjusting device is arranged at an opening of the penetrating passage in the first occlusion disc; characterized in that a protruding portion on an outer side of the switch adjusting device is arranged outside the first occlusion disc; a valve and a plurality of friction plates on an inner side of the switch adjusting device extend inside the opening of the penetrating passage; the plurality of friction plates are connected to the valve, and a number of the plurality of friction plates is at least two; the plurality of friction plates are controlled to be opened or closed by rotating the valve, to control the penetrating passage to be opened or closed; the occlusion device is an elastic mesh structure configured to produce an elastic deformation; and the adjusting rod is a hollow rod-shaped structure allowing the artificial chordae tendineae to pass through; two clamping jaws are arranged at a head of the adjusting rod; the two clamping jaws are connected to a handle at a tail of the adjusting rod by a spring; the two clamping jaws are controlled to be opened and closed by pressing the handle at the tail of the adjusting rod; the two clamping jaws are configured to be clamped on the protruding portion of the switch adjusting device to be connected to the occlusion device and wherein, when the adjusting rod is connected with occlusion device, the valve of the switch adjusting device is configured to rotate by rotating the adjusting rod.