Green certificate trading（GCT）and carbon emission trading（CET）are effective means to promote low-carbon operation of power system economy at present stage. However, current green card system does not perform well in encouraging grid connection of renewable energy and easing pressure of financial subsidies, and current carbon market has no obvious effect on promoting emission reduction, and generally presents the characteristics of“isolated operation”. Therefore, in order to break the barriers between traditional green certificates and carbon market transactions and effectively link up the market mechanism, a block-chain based carbon rights green certificates joint trading market framework and incentive mechanism were designed. Firstly, smart contracts are compiled to run power purchase/sale, carbon rights and green card transactions on the Ethereum platform, ensuring the safe, efficient, automatic execution and information transparency of joint market transactions. Secondly, concept of carbon token is introduced, and DPoS-CT consensus algorithm considering carbontoken is proposed to encourage market players to make more contributions to carbon emission reduction. Finally, proposed mechanism can effectively stimulate renewable energy trading and limit the carbon emissions of thermal power units through an example analysis, providing new ideas for the construction of the GCT and CET market.