The invention discloses an LED light-emitting device comprising a transparent base. At least one groove is distributed on the transparent base. An LED chip is arranged in each groove. Each LED chip includes a transparent substrate and an epitaxial layer formed on the transparent substrate, a transparent conductive layer is arranged on the epitaxial layer, and the transparent conductive layer at least extends to the transparent substrate. By adopting the design of the invention, the LED light-emitting device can achieve 4-Pai solid-angle surface light emission and high light efficiency (about 20% higher than the efficiency of an ordinary 2-Pai solid-angle lamp), light-emitting modules of different voltages can be produced, and the LED light-emitting device is low in cost, high in reliability and easy to mass-produce in a standardized manner.