The invention provides an acousto-optical monitoring device for the dripping speed of intravenous infusion. The device is characterized by comprising a shell, an input display part, a collection part,a microprocessor, a buzzer alarm and a power supply. According to the input display part, a user can input and set the upper limit and lower limit of the infusion dripping speed, the dripping coefficient of an infusion apparatus and the capacity of an infusion bottle, and the input display part displays the upper limit and lower limit of the infusion dripping speed, the dripping coefficient of the infusion apparatus and the capacity of the infusion bottle; the collection part comprises a clamping frame and a counting assembly which is used for collecting dripping information of infusion liquid drops; the microprocessor processes the dripping information of the infusion liquid drops to obtain the real-time infusion dripping speed, stores the real-time infusion dripping speed, controls theinput display part to display the real-time infusion dripping speed and outputs an alarm signal according to the real-time infusion dripping speed, the upper limit and lower limit of the infusion dripping speed and the capacity of the infusion bottle; the buzzer alarm gives out an alarm song according to the alarm signal; the counting assembly comprises an infrared photoelectric sensor, an inner support, a buffer slice and a light blocking slice. The acousto-optical monitoring device for the dripping speed of intravenous infusion has the advantages of being safe, efficient, accurate and timely.