The invention discloses a stamp trading method based on a block chain. The method comprises the following steps: firstly, obtaining a first block chain code printed on a solid stamp, and according tothe first block chain code, querying a stamp owner of the solid stamp on the block chain; secondly, obtaining the first block chain code printed on the solid stamp; finally, searching the stamp owneron the block chain. Upon confirmation that the owner of the stamp is the seller and receipt of the order for the transfer of the physical stamp initiated by the owner, the first block chain code is transferred to the buyer of the stamp, and finally the seller of the stamp transfers the physical stamp to the buyer of the stamp, completing the transaction of the stamp. The technical proposal of theinvention can record the issuing, trading and circulating information of each stamp, and improve the collection value of the stamp.