The invention discloses an auxiliary 
stent for puncture, and relates to the technical field of auxiliary stents for medical hemostatic balloons. Specifically, the auxiliary 
stent comprises a clampingplate, a fixed tube sheet and a hemostatic 
balloon, wherein a first threaded mouth is formed in the bottom of the clamping plate, a first 
threaded rod penetrates the interior of the first threaded mouth, and a fixing clamping plate is connected to the top of the first 
threaded rod; a second threaded mouth is formed in the top of the clamping plate, a second 
threaded rod penetrates the interior ofthe second threaded mouth, and a bearing is connected to the inner end of the second threaded rod; and the fixed tube sheet is fixed to the top of a connecting piece, and the hemostatic 
balloon is arranged inside the fixed tube sheet. According to the auxiliary 
stent for puncture, a lower pressing plate can be lifted vertically so as to adjust the distance between the lower pressing plate and thebottom of the inner wall of an arm placing tube, arms of different thickness and size can be clamped conveniently through the arrangement, an observation 
skylight is formed in the middle of the arm placing tube, the observation 
skylight can be used for observing the situation of the puncture site of the arms in real time, and meanwhile air circulation inside the arm placing tube can be maintainedconveniently.