Abstract: A level detector of intravenous drip comprising a shell body with a electromagnetic sensing circuitry, an alarm lamp and a buzzer installed internally, two electromagnetic inducting slices stretch out from the electromagnetic sensing circuitry to measure the liquid level inside the intravenous drip and remind the medical personnel; the shell body is fixed externally to the intravenous drip, two electromagnetic inducting slices sense the voltage difference generated by the liquid flow frequency inside the intravenous drip to measure the liquid level, the sensed voltage difference signals drive the alarm lamp and the buzzer inside the shell body for sound and light warning effect, to remind the medical personnel for following tasks, such can reduce the waste of medical resources and very convenient to install and apply.