The invention relates to a high-power light-emitting diode (LED) illuminating and LED nightscape illuminating reflecting cover. The reflecting cover can realize the change of a point light source into a surface light source by reflection and refraction and comprises a plurality of square-funnel-shaped reflecting concaves, wherein each reflecting concave corresponds to one LED light source; and the entire front reflecting surface area is large and the bottom area is small, so that the reflecting cover can be arranged on an arc-shaped and spherical surface so as to form an arc-shaped and circular luminous body. The reflecting cover is provided with a break line which can be broken (or cut) for using when a small-sized lamp shell or a special-shaped lamp shell needs to be used separately; the reflecting cover is formed by performing hot injection on engineering plastic; a front side serving as a reflecting surface is coated with a reflecting film; and a back side is provided with a space for arranging electronic components such as a constant-current power supply and a protection circuit.