Pre-clamping device and valve repair system

The invention provides a pre-clamping device and a valve repair system. The pre-clamping device comprises a conveying shaft and a clamping assembly. The conveying shaft is provided with a conveying cavity extending in the axial direction and a containing cavity, the conveying cavity penetrates through the two opposite ends of the conveying shaft, the containing cavity penetrates through the far end of the conveying shaft, and the conveying cavity is used for movably installing the suture implanting device in a penetrating mode. The clamping assembly comprises an upper clamping piece and a lower clamping piece, the upper clamping piece comprises an upper clamping push rod movably installed in the containing cavity in a penetrating mode and an upper clamping part arranged at the far end of the upper clamping push rod, and the lower clamping piece comprises a lower clamping push rod movably installed in the containing cavity in a penetrating mode and a lower clamping part arranged at the far end of the lower cla