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 define 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, wherein the second sleeve is provided in an axially slideable manner； an elastic element adapted to allow the second sleeve moves axially toward outside the receiving space, wherein: the needle mount or the first sleeve is provided with a stop surface and a limit groove； the second sleeve is provided with a limit arm comprising a limit face and a protruding member which is adapted to enter the limit groove with axial relative movement between the first sleeve and the second sleeve； the limit face has a first radial location and a second radial location, the location of the limit face is adapted to be changed radially based on elastic deformation of the limit arm； in the first radial location, the limit face is adapted to pass axially the stop surface, and in the second radial location, the limit face is adapted to abut against the stop surface to prevent the second sleeve from moving axially further toward inside the receiving space.
