Fluorescent carbon dots have attracted significant interest for their non-toxicity, low cost and unique photoluminescence properties. Generally, the preparation and usage of carbon dots(CDs) are in solution. With the increase of CDs concentration, their fluorescence intensity may be reduced or even quenched. Following, the solid-state fluorescent CDs powder obtained by simple drying often lack of fluorescence properties. Therefore, there are relatively few researches on the preparation and related applications of solid-state fluorescent CDs. The article describes recent preparation methods of solid-state fluorescent CDs, including post-processing methods(matrix dispersion method, surface engineering) and direct synthesis method. The changes of fluorescence properties of CDs before and after treatment are compared, and the main problems in preparation and application of solid CDs are summarized. Meanwhile, the preparation, performance modulation of solid-state fluorescent CDs are prospected. It is very crucial to exploit the CDs with the enhancement of aggregation induced emission, which provides a new strategy for the development of solid-state fluorescence CDs.