An intravenous infusion counter/alarm for counting the flow of drips, displaying dynamic speed of dripping, and alarming during malfunction, with at least a main body, an adjusting member which can be received by the main body in order to connect to a drip infusion tube, and a control circuit for providing a light source, light sensing unit, and control signals to detect the flow of dripping, to display the dynamic dripping speed, and to actuate an alarm when the flow deviates from a set value.