The invention discloses a green card trading method and system based on clean energy generation. The green certificate is the clean energy electronic certificate corresponding to the clean energy. Themethod comprises the following steps: obtaining the green certificate demand information, wherein, the green certificate demand information includes: the number of green certificates to be traded atthe energy demand end, and each green certificate corresponds to the preset clean energy quantity; assigning clean energy corresponding to the number of green certificates to be traded to the energy demand end according to the green certificate demand information; recording the green card transaction information generated for trading the green card, and merging and encrypting the green card transaction information to obtain a new block; loading a new block into an energy block chain, wherein the energy block chain is used for storing all energy transaction information, and the energy block chain includes a plurality of blocks, each block being linked in a timestamped timing sequence. The invention solves the technical problem that the source of the clean energy cannot be understood when the clean energy is traded in the related art.