The invention discloses an aging device of a thin film electronic device and a method, which belongs to the technical field of the solar cell. The online aging device of the solar cell comprises a furnace body, a front door and a back door. The front door and the back door are arranged on the two ends of the furnace body, a heating zone and a cooling zone which are isolated from each other are arranged in the furnace body, a transmission mechanism which is used for conveying a solar cell aging frame is arranged in the heating zone and the cooling zone, and a positioning sensor is arranged on the inner wall of the furnace body. The heating temperature, heating time, cooling time and temperature control for aging can be set according to requirements of different products and different processes. The invention can realize the online continuous automated production, thereby reducing the labor intensity, saving the handling time and greatly improving the production efficiency. The number of the sections of the heating zone and the cooling zone can be changed according to production needs and changes in process parameters, and the sections can be connected simply and installed conveniently.