The utility model discloses a can adapt to photovoltaic water -pumping system that illumination intensity changes, including photovoltaic module, converter and the water pump that connects gradually, photovoltaic module includes base wad group, solar energy membrane and strip physique, the strip physique is placed in one side of the upper surface of base wad, is provided with the pivot in the internal rotation of bar. The one end winding of solar energy membrane is in the pivot, and the lateral wall that its other end activity runs through a physique just covers the upper surface of heat insulating mattress totally. Base wad group comprises a plurality of base wad. It can be according to illumination intensity's change adjusting water pump rotational speed adopt to follow the trail of the converter, makes output be close to solar cell array 's maximum power, when sunshine is very sufficient, guarantee the water pump with rated revolution work, when illumination less than the time, the automatic shutdown moves. In the time of can working as the weather in bad order, roll the solar energy membrane, it can the membrane to have protected too, and can be according to usage space independent assortment base wad, and it is big or small to form suitable base wad group.