The invention discloses an emitting organic laser thin film device equipped with a gold nanoparticle enhanced light pumped surface and an application and a preparation method thereof. The device is based on the gold nanoparticle local surface plasmon resonance effect and scattering effect so that the properties of surface emitting laser can be effectively improved, including enhancement of emitting intensity, reduction of threshold and enhancement of quality factor. The device is characterized in that the device is composed of a glass substrate, gold nanoparticles, a spacing layer and a gain medium. The laser gain medium is composed of doped small organic molecule host and guest materials. The spacing layer and the gain medium are identical in the host materials. The laser structure is used as a color conversion layer to be applied to an organic electro-diode, and an organic dye thin film layer can be excited to emit light in the combined device by using light emitted by the light-emitting layer so that an effective scheme can be provided for realizing a simple structure electrically pumped organic laser device. The structure is prepared by a vacuum vapor plating method so as to be easy and fast.