The utility model provides a solar groove-type heat collecting tube fixing seat and a solar groove-type heat collecting tube supporting structure. The fixing seat comprises a fixing seat base (1) and a fixing seat gland (2). The fixing seat base (1) is in the shape of an upper arc, the fixing seat gland (2) is in the shape of a lower arc, after the two ends of the fixing seat base (1) and the two ends of the fixing seat gland (2) are fixed together, a cavity used for fixing the position of a weld joint of a solar groove-type heat collecting tube (3) is formed, and a groove matched with the weld joint (4) of the solar groove-type heat collecting tube is further machined in the position, where the fixing seat base (1) and the fixing seat gland (2) make direct contact with the fixed weld joint of the solar groove-type heat collecting tube. The heat collecting tube can be firmly and reliably fixed, a glass shell of the heat collecting tube can be prevented from being broken and damaged, and normal use of the heat collecting tube is guaranteed.