Abstract: As the new driving force of the world economic development and the important engine for the new round of scientific and technological revolution, the digital economy has become an important force to drive the improvement of the efficiency of the economic system and the optimization of the structure, and has injected new impetus into the collaborative development of the large, medium and small enterprises. The digital economy can not only drive the information links among the large, medium and small business through the factor supple and tool support of the infrastructure, but also create and promote the collaborate ecological construction to drive the effective integration of the large, medium and small enterprises through the opportunities created by the digital scenarios, so as to form such typical integrative modes as the platform integration to enable digitally the large, medium and small enterprises, the industrial chain integration pulled by the chain hosts, and the ecological integration with the characteristics of innovation and entrepreneurship. Faced with the practical problems such as weak willingness, insufficient impetus and unclear modes, it is necessary for the large,medium and small enterprises to smooth the data connecting channels, let the large enterprises play the driving role, increase the willingness of SMEs to integrate actively, and building a long-term mechanism to ensure the effective integration among the large, medium and small enterprises. It is recommended to further strengthen the construction of digital infrastructure and digital platforms, give priority to the integrative development of the key industries, support the construction of the digital integrative carrier, accelerate the digital transformation of the service system for SMEs,and strengthen the governance to digital platforms.

Key words: collaborative development, digital economy, collaborative platform, business competition