Aiming at the problem that it is not easy to carry out water quality testing on the center waters such as inland rivers, lakes, large aquaculture ponds, etc., a remote water quality testing system based on the cloud platform is designed. The system is mounted on an unmanned boat. The microcontroller STM32 completes the control of the water quality testing cloud platform sampling, navigation system data transmission, and unmanned boat navigation. Among them, the water quality detection system can accomplish the detection of five kinds of substances closely related to water quality, including pH value, temperature, conductivity, TDS, and turbidity in water. At the same time, the microcontroller is configured with a wireless Bluetooth module. Through wireless transmission, the communication between the upper computer and the lower computer, transmission, and processing of test data is completed. Based on the LabVIEW platform, the Web client of the water quality testing system and the cell phone mobile remote monitoring system app were developed. It can display and monitor the test results in real-time and improve the efficiency and intelligence of water quality testing.