The present invention is related to a safe vein detained needle, comprises a detained needle seat fixedly provided with a detained trocar, a protective seat, a puncture needle seat fixedly provided with a puncture needle, a withdrawing part, and a pushing seat. Before a puncturing process, the pushing seat is pushed forward, such that the withdrawing part is coupled to the puncture needle seat. After the puncturing process is completed, then, the pushing seat is pushed backward, such that the puncture needle seat is drawn backward along with the coupled withdrawing part, so as to retrieve the puncture needle on the puncture needle seat into the protective seat. Thereby, the puncture needle is retrieved into the protective seat after the puncturing process is completed, so as to avoid the risk of accidental pricking wound to medical personnel by the used puncture needle.
