Xi Jinping once stressed in the national propaganda and ideological work conference that, "Ideological work is an extremely important work of the Party. We must hold the leadership, management and discourse power of ideological work firmly in our hands, and at no time can we neglect it." The internet has become a new space for consensus building. It is vital to enhance the leading power of the mainstream ideology of the internet. However, the leading ability of the current network mainstream ideology cannot fully adapt to the complexity of cyberspace, the leading mechanism cannot fully mobilize the enthusiasm of the object, the leading methods are lack of effectiveness, the leading resources integration is limited, and the leading force cannot be fully formed, which cannot fully adapt to and meet the needs of ideological construction in the new era. According to the research, the big data approach meets the requirements of the leading force of the mainstream ideology of the network, which is mainly manifested in the following aspects:first, big data accurately captures the risk points of the network ideology; second, big data timely grasps the interest points of the network ideology; third, big data links and integrates the resources of the network ideology; and fourth, big data integrates into the "network" life circle of the public in the new era. Therefore, the application of big data thinking and methods can improve the leading power of mainstream ideology in the following four aspects:first, improve the leading ability of the leading subject, and improve the leading subject's ability by establishing big data awareness, actively learning big data technology and being good at applying big data technology. The second is to stimulate the motivation of the objects to participate in the guidance, and stimulate the motivation of the objects by optimizing the decision-making mechanism of ideological guidance, enhancing the dynamic mechanism of ideological guidance, and optimizing the coordination mechanism of ideological guidance. The third is to gather a comprehensive thought leading force, through accurately capturing the explosion points of the internet, accurately identifying the interests of netizens, accurately grasping the demands of netizens, and actively integrating into the life circle of netizens. Fourth, enhance the effectiveness of the thought leading process by establishing the concept of big data integration resources for sharing and governance, developing a win-win big data sharing platform, and implementing the integration mechanism of big data grid resource management. Through the above four aspects, we can effectively enhance the leading force of mainstream ideology in cyberspace.