The present disclosure relates to a disposable injection needle, including: a needle mount, having a tube needle； a first sleeve, one end of which is suitable for connecting to the needle mount to form receiving space, and the other end of which is provided with a first opening； a second sleeve, one end of which is located inside the receiving space, and the other end of which having a second opening extends out from the first opening, wherein the second sleeve is axially slideable； an elastic element adapted to allow the second sleeve to move axially toward outside the receiving space, wherein: the second sleeve is provided with a sleeve guiding portion, and the needle mount is provided with a guiding engagement portion, the sleeve guiding portion engages with the guiding engagement portion to guide the circumferential rotation of the second sleeve based on axial movement of the second sleeve toward inside of the receiving space； the first sleeve is provided with a blocking member and the second sleeve is provided with a fastener, wherein the blocking member and the fastener are arranged to allow the fastener to pass through the blocking member in the axial direction toward the second opening, and to prevent the fastener from passing through the blocking member in the axial direction away from the second opening to prevent the tube needle from being exposed via the second opening.
