Public participation in public procurement is an important guarantee for its sustainable and healthy operation. In the era of digital economy and big data, public participation in information disclosure, service quality, and service pricing in public procurement plays an important role. Public private partnerships are an innovative form of public procurement. This study sorts out the issues of public participation in PPP projects, and puts forward several suggestions based on data thinking. In terms of public procurement project information disclosure, big data technology is used to improve the timeliness and breadth of information disclosure, and enhance the professionalism of information disclosure. Performance-oriented public procurement focuses on service quality, and guarantees service security through information platforms and professional third parties. The stakeholders use big data to supervise social organizations, so that they actively represent the public to file lawsuits in public procurement and relieve the public’s damaged rights and interests. The protection of the public’s right to know, suggest and supervise is inseparable from the training of professional talents by universities. Colleges and universities attach great importance to the cultivation of big data-oriented public procurement professionals, which includes improving teachers’ teaching ability, building a new knowledge system that combines big data and public procurement, and setting professional courses for students at different learning stages through connotative development.