Infusion alarm

When the infusion alarm is used, a first hook body is hung on an infusion support, an infusion bottle is hung on a second hook body, and when a first guide rod is in threaded connection with a screw hole in a sliding block, a spring is stretched; when the second guide rod is in threaded connection with the screw hole in the sliding block, the spring is compressed; along with infusion, the spring gradually recovers to the initial state; when the infusion bottle is close to an empty bottle state; the second conducting strip is in contact with the first conducting strip; alarm loop communication,accompanying nurses, nurses or patients can be reminded to replace liquid or pull out infusion needles in time; the use state of the spring can be switched along with the use time, and when the spring is stretched to the state that the elastic restoring force is reduced, the spring can be switched to the state that the spring is compressed, so that the elastic restoring force of the spring is kept, and the service life o