A support structure made of precast concrete and a building thereof, comprising a building top portion and at least a support structure. Said building top portion includes at least a thin film solar cell and a steel frame lateral beam structure supporting said thin film solar cell. Each said support structure includes a support column and a base, said support column supports said building top portion, and said base is at bottom of said support column. Said support column and said base form integrally into one piece by means of concrete material.