Privacy computing refers to a technical system that realizes data value mining under the premise of providing privacy protection. In the context of the vigorous development of big data，people are increasingly eager to meet the needs of privacy protection while enjoying various services，and the block chain can build a trust foundation in a low-cost manner under the scenario of multi-stakeholder participation. The combination of block chain and privacy computing technology has strong application value. This article gives a brief overview of the technology of block chain and privacy computing platform，focusing on the architecture of the privacy computing platform based on block chain technology，and finally introduces the data circulation and sharing scheme based on the trusted computing block chain business platform.