Disclosed is a puncture depth controlling and needle hiding device and a usage method thereof. The puncture depth controlling and needle hiding device comprises a housing and an inner sleeve. The inner sleeve is positioned in the housing and is rotatable. Correspondingly matched limiting structures are provided on an inner wall of the housing and an outer wall of the inner sleeve. A spring is provided between the housing and the inner sleeve to push the proximal ends of the housing and the inner sleeve to be separated and keep the inner sleeve at an initial axial position with respect to the housing. By means of the invention, the medicinal liquid injection operation is simplified, and the need insertion depth is accurate. A needle hiding structure reduces the risk of accidental stab.
