The present invention provides an organic electroluminescence device and a manufacturing method thereof. The organic electroluminescence device includes: an organic backing layer (22), which provides a flexible base and isolates external moisture; a light absorption layer (24), which is arranged on the organic backing layer (22); an active thin-film transistor pixel array, which is arranged on the light absorption layer (24), the active thin-film transistor pixel array comprising at least a crystalline semiconductor layer that is formed by means of laser annealing; and an organic electroluminescence layer (29), which is arranged on the active thin-film transistor pixel array. The light absorption layer (24) absorbs the laser that transmits through the active thin-film transistor pixel array and irradiates the light absorption layer (24) during the laser annealing in order to prevent the organic backing layer (22) from being affected by the laser and getting deteriorated.