A flat panel solar collector is a device that absorbs solar radiation energy and transfers heat to the workpiece. It is a special heat exchanger in which the workpieces in the collector exchange heat with the sun over a long distance. Flat panel solar collector is composed of heat absorbing plate core, shell, transparent cover, insulation material and related parts. When a circulating pipe is added to the insulated water tank, it can absorb the radiant heat of the sun and raise the water temperature.