Safe and self-shrinkage type remaining needle

The utility model provides a safe and self-shrinkage type remaining needle. The safe and self-shrinkage type remaining needle comprises an outer protecting sleeve, a puncture needle, a sleeve, a sleeve seat, an isolating plug, an inner protecting sleeve, a needle seat, an external extending tube, an external extending tube joint and a flowing stopping valve, wherein the needle seat is arranged at the rear end of the puncture needle; the puncture needle is arranged in the sleeve; the outer protecting sleeve for protecting the sleeve is arranged at the outer part of the sleeve; the sleeve seat is arranged at the rear end of the sleeve; a cavity is axially formed in the sleeve seat; the sleeve seat is communicated with the cavity of the sleeve; the isolating plug is arranged into the cavity in the sleeve seat; the inner protecting sleeve is arranged into the cavity in the sleeve seat on the rear surface of the isolating plug; the front part of the sleeve seat is communicated with the external extending tube joint through the external extending tube; the flowing stopping valve is arranged on the external extending tube. The safe and self-shrinkage type remaining needle has the advantages that the problem that the medical staff is injured by a steel needle during drawing off the needle and infected by disease can be avoided; the working is safe and reliable; the safety and sanitation are ensured; the safety of the medical staff can be ensured; after puncturing, a handle can be rotated to automatically shrink the remaining needle, and thus the remaining needle can be conveniently moved out.