The utility model discloses a solar thermal collector with a thin film. The solar thermal collector comprises a frame, a cover plate, a heat absorption body, a heat insulation layer and a back plate, wherein the cover plate, the heat absorption body, the heat insulation layer and the back plate are arranged on the frame, and the thin film is arranged on the frame and between the cover plate and the heat absorption body. The thin film with a heat insulation function is arranged inside the heat collector, and heat loss of the heat collector is effectively reduced with low cost.