The LoRaWAN water quality potassium ion sensor adopts the ion selective electrode method, combined with LoRaWAN wireless transmission technology, to achieve online monitoring of potassium ion concentration in water. Equipped with automatic temperature compensation and anti light interference function, measuring range of 0-1000mg/L, accuracy of ± 10% or ± 1mg/L of reading, protection level IP68, supporting low-power sleep and Class A/C working mode. No need for reagents, no secondary pollution, suitable for scenarios such as surface water, drinking water, agricultural irrigation, and aquaculture. The data is remotely transmitted to the cloud platform through the LoRaWAN gateway, facilitating real-time viewing and warning, and helping with smart water management and precision agriculture management.