The invention relates to an improved transfusion alarm and a use method thereof. The transfusion alarm comprises a liquid level detection device and an alarming device, wherein the liquid level detection device comprises a puncture needle body, a
prism, a first
optical fiber, a second
optical fiber and an
optical fiber connecting head; and the alarming device comprises an optical
fiber connecting seat, a
light emitting diode, a photosensitive
diode, a
signal amplification circuit, a reference
voltage circuit, a comparison circuit, a singlechip
microcomputer, a sound-light alarm circuit, an
electronic switch, a
peripheral circuit and the like. The improved transfusion alarm is simple in structure, safe and reliable, low in manufacturing cost and convenient to use, and is suitable for
mass production and large-scale use, and the working amount of nurses is not increased; a photoelectrical principle is used to detect the liquid level; the optical fibers are utilized to transmit signals to the alarming device; the transfusion alarm is high in alarming accuracy, and is not influenced by the factors such as
medicine liquid containers and the liquid level detection device; and electrolytic reaction cannot be generated on the
medicine liquid. With the adoption of the transfusion alarm, the liquid level detection device is separated from the alarming device; and the liquid level detection device is extremely low in cost and is disposable, so that safety is ensured; and the alarming device can be used repeatedly, and has the characteristics of
energy conservation, environment friendliness and the like.