A light-emitting module with an optical thin-film surface layer, comprising: a transparent envelope shaped as a hollow sphere or a partial hollow sphere and having a first wall and a second wall opposite to the first wall, said first wall having a first inside wall surface and a first outside wall surface, said second wall adjoining said first wall and having a second inside wall surface and a second outside wall surface; an optical thin-film which being a multiple layers film and having a long wave pass light filter function, and being coated on the first inside wall surface or the first outside wall surface of the transparent envelope on more than 30% of the area of the wall surface, said optical thin-film reflecting light rays that at least comprise part of or all ultraviolet or blue light exciting a fluorescent/phosphorescent layer and transmitting visible light that is in the long-wave band of visible wave length to emit through the optical thin-film; a light-emitting part shaped as a sphere, a spherical area or a partial sphere arranged in the transparent envelope so the transparent envelope and the light-emitting part being space-arranged for emitting ultraviolet or blue light by at least one ultraviolet or blue light-emitting diode, or a light-emitting tube or electrodes for direct discharge provided in the light-emitting part; and a visible light layer formed of the fluorescent/phosphorescent layer, said visible light layer being coated on the second inside wall surface or the second outside wall surface of the second wall surface of the transparent envelope for exciting the ultraviolet or blue light into visible light, and the visible light layer being closer to the light-emitting part than the optical thin-film to the light-emitting part; wherein the distance c between any point A of the reflecting layer of arc of said optical thin-film and a center of sphere B of the light-emitting part meets the following relationship: c ≥ csc α × r, wherein r being the radius of the light-emitting part, α being the incidence angle at the point A of the reflecting layer of said optical thin-film and α being less than 60°, preferably less than 15°, and a connection line of A and B being the normal of the reflection angle at point A. a transparent envelope shaped as a hollow sphere or a partial hollow sphere and having a first wall and a second wall opposite to the first wall, said first wall having a first inside wall surface and a first outside wall surface, said second wall adjoining said first wall and having a second inside wall surface and a second outside wall surface; an optical thin-film which being a multiple layers film and having a long wave pass light filter function, and being coated on the first inside wall surface or the first outside wall surface of the transparent envelope on more than 30% of the area of the wall surface, said optical thin-film reflecting light rays that at least comprise part of or all ultraviolet or blue light exciting a fluorescent/phosphorescent layer and transmitting visible light that is in the long-wave band of visible wave length to emit through the optical thin-film; a light-emitting part shaped as a sphere, a spherical area or a partial sphere arranged in the transparent envelope so the transparent envelope and the light-emitting part being space-arranged for emitting ultraviolet or blue light by at least one ultraviolet or blue light-emitting diode, or a light-emitting tube or electrodes for direct discharge provided in the light-emitting part; and a visible light layer formed of the fluorescent/phosphorescent layer, said visible light layer being coated on the second inside wall surface or the second outside wall surface of the second wall surface of the transparent envelope for exciting the ultraviolet or blue light into visible light, and the visible light layer being closer to the light-emitting part than the optical thin-film to the light-emitting part; wherein the distance c between any point A of the reflecting layer of arc of said optical thin-film and a center of sphere B of the light-emitting part meets the following relationship: c ≥ csc α × r, wherein r being the radius of the light-emitting part, α being the incidence angle at the point A of the reflecting layer of said optical thin-film and α being less than 60°, preferably less than 15°, and a connection line of A and B being the normal of the reflection angle at point A.