Plate solar hot water engineering system, is by the flat collector, heat storage water tank, auxiliary heating system, intelligent control system, pipeline and circulatory system combination, can be arbitrarily set out of the water temperature, can according to need and conventional energy cooperation, realize the semi continuous 24 hours hot water supply heat type solar water heating system. Flat plate collector accept solar radiation, will collect the sun's radiant energy into heat energy, heating the water in the vacuum tube collector and gradually; When the water temperature reaches set temperature inside the collector, through a temperature sensor, temperature controllers and solenoid valves, pumps and other equipment, the hot water from the collector to heat preservation function of store is stored in the hot water tank, automatic filling into the cold water at the same time. When water levels reach the upper limit of heat storage water tank, the temperature controller to start the corresponding equipment, the system operation mode will be automatically converted into fixed temperature circulation, formed between the collector and the tank circulation, continue to use solar radiation energy, further improve the water tank water temperature.