Method and device for upgrading block chain system and terminal equipment

The invention belongs to the technical field of computer application, and provides a method and device for upgrading a block chain system and terminal equipment. The method comprises the steps that: after participant nodes in the block chain system update an initial binary program into a target binary program, a first target support version number of the block chain system is determined; a first target upgrade version number shared by the participant nodes in the block chain system is calculated according to the first target support version number; and when the voting result of the participant nodes on a system upgrading proposal transaction indicates that the participant nodes are in favor of the system upgrading proposal transaction, upgrading the system version of the initial operation version number currently operated by the block chain system to the system version of the first target upgrade version number. According to the method and the device, the problem that the block chain system cannot reach a con