With the continuous development of our society and economy, single-chip microcomputer is gradually applied to the fields of industry, agriculture, medical treatment and people's life, and effectively promotes its healthy and rapid development. The emergence of intelligent water temperature control system will bring great convenience to people. It has broad development prospects and great development space, and becomes a new generation of fashionable household products. Temperature detection plays a very important role. Through the real-time acquisition of the temperature of the water temperature of the single-chip microcomputer, a scientific and effective control and alarm system is designed, which makes the designed system simple in configuration, convenient in actual operation and practical. Through the software programming to realize the control algorithm and the related parameter design, so as to realize the main requirements of the water temperature control system. The single-chip microcomputer detects and forewarns the water temperature through the temperature sensor, and then realizes the control of the water temperature. The system integrates data acquisition, display, control and processing. The system is simple, practical, reliable and easy to expand. The water temperature regulating system is based on the single chip microcomputer as the control core, and includes temperature sensor, receiving module and other modules, aiming to reduce and control the raw material consumption of the submersible water heater more effectively.With the continuous development of solar water heaters, more and more people choose solar water heaters, especially the core equipment of solar water heaters. Solar water heater enterprises can continuously improve the equipment in the industry. They are slowly optimizing the level of solar water heater related functions, and slowly increasing investment, so that too many users. The operation of solar energy is relatively simple, so the intelligent requirements for solar water heaters also need to be gradually improved.