A disposable injection needle, including: a needle mount provided with a tube needle that extends axially therethrough; a first sleeve, one end of which is suitable for connecting to one end of the needle mount to form receiving space between the first sleeve and the needle mount, 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 part of the second sleeve is provided in an axially slideable manner inside the receiving space, and the tube needle is adapted to protrude through the second opening; an elastic element adapted to provide elastic force for the second sleeve to move axially toward outside the receiving space, and the second sleeve is adapted to retract inward the receiving space based on an external force overcoming the elastic force, so as to expose the tube needle, characterized in that: the needle mount or the first sleeve is provided with a stop surface and a limit groove which extends axially; the second sleeve is provided with a limit arm, the end of the limit arm has a limit block and a protruding member which protrudes radially, the end face of the limit block in the axial direction constitutes a limit face, the protruding member 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 case that the limit face is in the second radial location, the protruding member is in the limit groove and 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; and the protruding member is a fastener which is adapted to hook or abut against one end of the limit groove when the protruding member in the limit groove moves toward the first opening. a needle mount provided with a tube needle that extends axially therethrough; a first sleeve, one end of which is suitable for connecting to one end of the needle mount to form receiving space between the first sleeve and the needle mount, 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 part of the second sleeve is provided in an axially slideable manner inside the receiving space, and the tube needle is adapted to protrude through the second opening; an elastic element adapted to provide elastic force for the second sleeve to move axially toward outside the receiving space, and the second sleeve is adapted to retract inward the receiving space based on an external force overcoming the elastic force, so as to expose the tube needle, characterized in that: the needle mount or the first sleeve is provided with a stop surface and a limit groove which extends axially; the second sleeve is provided with a limit arm, the end of the limit arm has a limit block and a protruding member which protrudes radially, the end face of the limit block in the axial direction constitutes a limit face, the protruding member 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 case that the limit face is in the second radial location, the protruding member is in the limit groove and 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; and the protruding member is a fastener which is adapted to hook or abut against one end of the limit groove when the protruding member in the limit groove moves toward the first opening. the needle mount or the first sleeve is provided with a stop surface and a limit groove which extends axially; the second sleeve is provided with a limit arm, the end of the limit arm has a limit block and a protruding member which protrudes radially, the end face of the limit block in the axial direction constitutes a limit face, the protruding member 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 case that the limit face is in the second radial location, the protruding member is in the limit groove and 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; and the protruding member is a fastener which is adapted to hook or abut against one end of the limit groove when the protruding member in the limit groove moves toward the first opening.