Disclosed are a device for controlling puncture depth and hiding a needle and the usage method thereof, wherein the device comprises a housing (1) and an inner sleeve (3) that can accommodate and join the injection equipment the inner sleeve (3) is located inside the housing (1) and can move along the axial direction and rotate in the circumferential direction several correspondingly matched axial route location limiting structures are respectively arranged on the inner wall of the housing (1) and the outer wall of the inner sleeve (3) both the housing (1) and the inner sleeve (3) have an opening on the distal end and a through-hole on the proximal end, a spring (2) is arranged between the housing (1) and the inner sleeve (3), and its two ends respectively contact and are arranged on the inner wall of the proximal end of the housing (1) and the outer wall of the distal end of the inner sleeve (3), driving the proximal ends of the housing (1) and the inner-sleeve (3) to separate and enabling the inner sleeve (3) to maintain the original axial position relative to the housing (1) and a length marker element (11) and direction marker element (31) corresponding to a needle head of a syringe needle are respectively arranged on the outer peripheral surface of the housing (1) and the inner sleeve (3). The device simplifies the technical difficulty of the liquid medicine injection operation, the depth of insertion of the needle is accurate, and the best effect of the liquid medicine injection is guaranteed and at the same time, the hidden needle structure decreases the risk of unexpected pricking, relieves the anxious and frightened mentality of the operator, and satisfies the need for optimized self-administered injections for different populations of people.La présente invention concerne un dispositif de contrôle de profondeur de ponction et de couverture daiguille et le procédé dutilisation associé, le dispositif comprenant un boîtier (1) et un manchon interne (3) qui pe
