Improved normal saline injection pre-flushing device

The utility model discloses an improved normal saline injection pre-flushing device which comprises a pre-flushing device body, the pre-flushing device body is a polyethylene ampoule, the pre-flushing device body is composed of a bottle body, a bottle neck and a nipple, the bottle neck is arranged at the top end of the bottle body, the nipple is arranged at the top end of the bottle neck, and a head sleeve is sleeved outside the nipple. A plurality of friction protrusions are arranged on the outer wall of the nipple and arranged at intervals, a clamping groove is formed in the inner wall of the head sleeve, and the outer walls of the friction protrusions are attached to the inner wall of the clamping groove. The bottle body, the nipple and the head sleeve are arranged, the ampoule bottle made of polyethylene replaces a glass ampoule bottle to place normal saline, and the nipple is matched with the head sleeve, so that the ampoule bottle can be opened once being used, the operation is convenient and safe, the