A chip-scale linear light-emitting device includes a submount substrate, light-emitting diode (LED) semiconductor chips, a chip-scale packaging structure and a reflective structure. The LED semiconductor chips, the packaging structure and the reflective structure are disposed on the submount substrate, wherein the packaging structure partially covers the chip-upper surface and/or the chip-edge surfaces of the LED semiconductor chips, and the reflective structure partially covers the package-top surface and/or the package-side surfaces of the packaging structure. If one of the chip-edge surfaces and the package-side surface of the packaging structure are exposed from the reflective structure as a primary light-emitting side surface, a side-view type linear light-emitting device is formed. If the package-top surface of the packaging structure is exposed from the reflective structure as a primary light-emitting top surface, a top-view type linear light-emitting device is formed. A substantially transparent light-transmitting material and/or a photoluminescent material can be configured to be included inside the packaging structure. In this configuration, a primary light emitted from the LED semiconductor chips is directed to pass through the packaging structure and radiated outward from the primary light-emitting surface. Therefore, a monochromatic light or a white light with a uniformly distributed linear radiation pattern can be generated using the chip-scale linear light-emitting device.