The digitalization of public culture in China has roughly formed three paths: digital facility system, digital resources system and digital service platform, which have played a positive role in breaking the "gap" of cultural information service and improving the ability of cultural service at the grass-roots level. But, under the background of promoting quality of public cultural services in the new era, the original concept of "public digital culture" is gradually questionable and the past experience has exposed its weaknesses and reduced its efficiency, which is urgent for the guidance of the Fifth Plenary Session of the 19th CPC Central Committee. In the long run, the great advance of digitalization of public culture cannot be realized without the scientific and integrated application of mobile Internet, cloud computing, big data, block chain technology.