The invention relates to a solar heat collecting tube. The heat collecting tube comprises a glass outer tube, a metal inner tube, kovar alloy rings and corrugated pipes; the metal inner tube is arranged in the glass outer tube, and is coaxial with the glass outer tube; two ends of the glass outer tube are sealed with the kovar allot rings; and the corrugated pipes are arranged at two ends of the glass outer tube, and are between the metal inner tube and the glass outer tube. As the glass outer tube and the metal inner tube have similar heat expansion coefficients, the matched sealing can be realized in high-temperature fusion sealing; and as the sealing place is low in internal stress, the glass outer tube and the kovar alloy rings cannot burst or deform after cooling. The metal and glass sealing is realized; and the vacuum measurement and thermal shock test results show that the solar heat collecting tube achieves high-temperature resistance, high air tightness and high reliability.