Distributed cloud storage data access method and data service system

The invention relates to a distributed cloud storage data access method and a data service system, data distributed and stored on each network node is subjected to clustering management, a cluster center node records data features published by cluster members by a bloom filter as index information, the cluster center node provides query service when a user needs to access the data, and the user can access the data. Target data is directly transmitted to a user by the positioned cluster members, and data query and data storage services are isolated, so that catastrophic loss caused by single-point failure after all data are stored in a central node is avoided; the data security can be ensured by taking the unidirectional data feature as the data index, and any third party cannot know the specific data object requested by the user; and meanwhile, a partial blind signature algorithm is adopted for constraining transaction parameters of consensus between two service parties, so that the two parties can autonomous