A solar collector with reflecting surfaces according to the present invention prevents overheating of the solar collector by reflecting the radiation in a way that the light beams, by means of a first transparent surface, are corrected to the preferred angle and further directed towards channels. On a second transparent surface the beams are directed again and on a third transparent surface the light beams are reflected if in the channels is air. If the working fluid flows through the channels, on the third surface there is no reflection, so the light beams pass through the opaque part of an absorber where the solar radiation is converted into the thermal energy that is then removed by the working fluid.