The invention provides a solar thermal collector which comprises two tube plate structures, wherein a certain included angle is formed between the two tube plate structures; the direction of the included angle is opposite to a bending direction of an arch-shaped structure of a reflecting mirror; the focus of the reflecting mirror is positioned between the included angle formed by the tube plate structures; thermal collection tubes are internally provided inner fins; the inner fins are connected with rectangular inner corners; the thermal collection tubes are internally divided into a plurality of small channels by the inner fins; communication holes are formed in the inner fins; the thermal collection tubes and the thermal collection plates are made of a copper aluminum alloy. As a novel copper aluminum alloy is researched and developed and applied to the thermal collection tubes, the function of thermal collection can be improved, and meanwhile the high-temperature resistance of the thermal collector can be greatly improved.