Connecting tube of reverse-flow-preventing infusion apparatus

The utility model discloses a connecting tube of a reverse-flow-preventing infusion apparatus. The connecting tube comprises a hard connecting tube body with two ends connected with an infusion hose respectively, a medicine filling hole is formed in the hard connecting tube body, and a flexible sealing plug is arranged at the position of the medicine filling hole in a sealing mode. The hard connecting tube body located at the lower portion of the medicine filling hole is provided with a reverse-flow-preventing cavity, a plugging block with a conical structure is arranged in the reverse-flow-preventing cavity, and supporting salient points are arranged at the edge position of the bottom concave surface of the plugging block. The hard connecting tube body located at the lower portion of the medicine filling hole is provided with a filter cavity, and a filter screen is arranged in the filter cavity. The outer wall of the hard connecting tube body close to the position of the medicine filling hole is a rough surf