The invention discloses a reflective light-transmitting band and a method for a laser LD light source. The reflective light-transmitting band for the laser LD light source consists of a laser LD light source, a reflective light-transmitting band, a light-transmitting bead sleeve and a reflective light-transmitting band. The method comprises the following steps that: a central incoherent beam group of the laser LD light source illuminates a light-transmitting bead, eccentric beams irradiate a reflecting area and a light-transmitting area, and a sphere, an ellipse, a cylinder and a circle inlaid with light disc spots are distributed beyond an axis of a light band of the light-transmitting bead of the light-transmitting bead sleeve; and the laser LD light source penetrates through and illuminates the reflective light-transmitting band and the light-transmitting bead to realize fluorescent display of the reflective light-transmitting band. The reflective light-transmitting band is applied to building surface alarming or light decoration, the energy-saving effect is obvious, the light display transmission effect is improved, the reflective light-transmitting band has a good transmission effect on a foggy day, industrialized, universalized, serialized and standardized production of the light band can be realized, and the reflective light-transmitting band is easy and feasible to mount.