The present disclosure provides a light supplementing lamp for a hemispherical camera and the hemispherical camera. The light supplementing lamp for the hemispherical camera includes a lamp source configured for generating a light supplementing source; a reflecting element configured for reflecting a light supplementing source generated by the lamp source; a lamp cover configured for transmitting a light supplementing source reflected by the reflecting element, so that a light supplementing area of the light supplementing lamp is suitable for a video monitoring area of the hemispherical camera; wherein, the reflecting element and the lamp cover are respectively arranged at two sides of the lamp source, and the reflecting element is arranged opposite to the lamp source.