A support structure for solar panel includes first supports, second supports, first platens, second platens, and optoelectronic units. Two first diversion grooves are formed in an upper part of the top protrusion, and second diversion grooves are respectively formed in the side protrusions. One end of the second support is connected to one side of the first support, and the third diversion grooves is formed in an upper part of each second support. The first platen is disposed on the upper part of the first support. The second platen is disposed on the upper part of the second support. The optoelectronic unit is disposed between the first platen and the first support, and is disposed between the second platen and the second support.