The optical energy smart water meter takes the absorption of light (light, scattered light and direct sunlight) as the energy source. When there is light, the energy storage battery panel charges the energy storage package, which supplies power for metering and sampling. The product does not need complicated and expensive pipeline laying, and the product layout can be adjusted at will. It is safe, energy-saving, pollution-free, and stable and reliable without manual operation. Save electricity cost and maintenance free. The built-in DC controller can ensure that the battery pack will not be damaged due to overcharge or overdischarge, and has the functions of light control, temperature compensation and reverse polarity protection. The metering method adopts photoelectric direct reading+electromechanical synchronization, the energy consumption can be detected and early warning can be given, the light energy can be converted into electric energy for recycling, the mobile phone recharge and payment can be supported, the water consumption can be queried, and the water meter supports the Bluetooth APP function. It can also be read in the absence of network signals. The product has its own power saving mode. When light is detected, the reporting frequency can be automatically changed. When there is no light, the energy saving mode is used. According to the actual use of users, you can set a cycle to report 24 hours of data through the network of the NB IoT platform. The low-power design is adopted, and the chip wakes up automatically. After the reported data is completed, the chip automatically enters the sleep mode, which is more energy saving.