The procuratorial organs, as the legal supervisory organs of our country, are explicitly entrusted with legal supervision duties by the Constitution. As an organic component and important part of legal supervision, investigation supervision is a key part of the full coverage of legal supervision in the process of criminal proceedings, and has important value. In judicial practice, the illegal conduct of investigative activities has been repeatedly banned, and in order to improve the criminal procedure supervision and control system, and to build an evidence-centred criminal accusation system, the establishment of investigative supervision and collaborative mechanisms is an inevitable choice. However, the investigation and supervision collaboration mechanism still exists in the operation of information barriers, prosecution and police assessment index differences, insufficient supervision rigidity, insufficient staffing factors, etc. By clarifying the concepts, refining the rules, and advancing the digital prosecution to improve the investigation and supervision collaboration mechanism, to enhance the quality and efficiency of the prosecution and police authorities in handling cases, and to promote the modernisation of legal supervision.