The invention provides an external formation method and device of a bipolar plate, belongs to the technical field of a lead storage battery and relates to an external formation method and device of a bipolar plate. The external formation method and device of the bipolar plate solves the problem in the prior art that the internal formation makes a person be difficult to obtain the formed polar plate in the first time in a bipolar battery research and development process, and the formation condition of the polar plate cannot be judged until the well-formed polar plate is taken out by adopting a battery disassembling method for subsequent tests. The bipolar plate external formation device comprises a formation groove; a baffle clamping groove is formed in the formation groove; a baffle is inserted to the baffle clamping groove; the baffle is provided with a polar plate window for installation of the polar plate; the baffle provided with the polar plate is inserted into the baffle clamping groove; and the formation groove is divided into independent electrolyte grooves. As the pluggable structure is utilized, convenience is brought to formation and detection of the polar plate; and the green bipolar plate is formed before the bipolar plate is assembled into a bipolar semi-finished battery, so that the formation condition of the polar plate can be detected at any time and conveniently.