The invention aims at providing a special refreshing tool and a refreshing method for automobile controller software, which are simple in structure, low in cost and convenient for use, and solve the problem about the modification and the upgrade of a control module of an automobile. The special refreshing tool for the automobile controller software provided by the invention comprises a power supply module, a data processing unit, a CAN (controller area network) transceiver, an OBD (on board diagnostic) connector assembly and a computer data interface connected with the computer, wherein the data processing unit is respectively connected with the power supply module, the CAN transceiver and the computer data interface, and the CAN transceiver is connected with the OBD connector assembly. The special refreshing tool for the automobile controller software provided by the invention has the advantages of low cost, convenience for carrying, fast rewriting speed, high accuracy and the like, and is very suitable for rewriting the software of the automobile controller in the development and maintenance process, with very good practicability.