The LXCY-type Internet of Things (IoT) ultrasonic valve-controlled water meter is a new type of water meter. It detects the time difference generated due to the change in the speed of the ultrasonic beam when it propagates downstream and upstream in water. By analyzing and processing this time difference, it can obtain the water flow velocity and further calculate the water flow rate. Then, it transmits data such as the water volume to the server through the NB-IoT (Narrow Band Internet of Things) for centralized management. It has the following characteristics: a low starting flow velocity, a wide range ratio, high measurement accuracy, stable operation, no moving parts or flow-blocking components inside, being unaffected by impurities in the water, a long service life, the ability to transmit data without the need to lay cables, collectors and other equipment, and it can be used immediately after installation.