The present invention relates to a safety device (40), including: a needle cage (41), which limitedly forms a longitudinal extended channel, the extended channel thereof is provided with a longitudinal opening (60) at least one spring clamp (50), which is arranged in the longitudinal extended channel via the longitudinal opening (60) and a stopping device, which is used for blocking the enlarged part (38) of a leading needle (31), wherein, the longitudinal extended channel can allow the leading needle (31) to penetrate the needle cage (41) longitudinally and extendedly, at least one spring clamp (50) is provided with a first clamping part (55) to be used for meshing with a guide pipe base (24), the shape of at least one part of at least one spring clamp (50) is prepared to that the shape is compressed by the leading needle before the leading needle is drew out from a guide pipe component (20) and is released to bounce and to capture a sharp distal needle tip (32) of the leading needle after the leading needle is drew out from the guide pipe component (20).
