Diffuser plate which has the function of scattering light is an important component of liquid crystal display (LCD). The common diffuser plates mainly divide into the type of surface with microstructure and internal particle scattering, whose essential properties are hazing and transmitting light. The diffuser plates with embedded quantum dots also feature color conversion and improve color rendering capabilities. Compared with the combination of a quantum dot enhancement film (QDEF) and a diffuser plate, the quantum dot diffuser plate (QD-DP) has the advantages of simpler preparation process, lower cost, and higher atomization ability, which is suitable for mini-LED backlight. This paper briefly summarizes the research progress of diffuser plate for liquid crystal display, and focuses on the preparation process and performance of a multi-layer QD-DP. In terms of stability, the prepared QD-DP can be stored for a long time in the environment of high temperature and high humidity (60 ℃/90%), and the lifetime (T95) exceeds 1 000 h under blue light irradiation (450 nm, 45 ℃/85%RH). Moreover, the luminance uniformity of QD-DP under 450 nm blue light irradiation is higher than 80%. The half-peak width of blue/green/red light is lower than 20 nm,25 nm,25 nm, respectively. The color gamut area reaches 99.58% of the DCI-P3 standard. In conclusion, QD-DP has excellent functions of color conversion and uniform light coupled with the characteristics of stable lifespan, which is expected to be widely used in large and medium-sized LCDs.