The invention discloses a personal data transaction system and method, and the system comprises a data transaction platform which is used for displaying data commodity information; a main management contract module which is used for constructing a storage contract, controlling the authority of the storage contract and processing data transaction; a data storage contract module which is used for storing the personal data and managing the personal data; a personal terminal module which is used for calling contract management data and authorizing data transaction; and a data purchaser module which is used for browsing through the data transaction platform to obtain the data commodities meeting the requirements. According to the scheme, a user can use the system more safely and conveniently, operation steps are reduced, the data are directly encrypted, the data are directly stored in a decentralized distributed system after being collected, self-management of the personal data is truly achieved, the whole transaction process of the data is executed through an intelligent contract, a third party does not need to operate and interfere, and data leakage is prevented.