The invention discloses an automatic spacecraft test data interpreting method. Telemetering data or a telemetering order is automatically interpreted by setting up an interpreting rule base, an interpreting conclusion data base and an executive engine on an existing telemetering measuring system. An interpreting conclusion is transmitted to a compressive testing and monitoring terminal to achieve automatic interpreting and displaying of spacecraft test data. Working efficiency in interpreting the telemetering data is greatly improved and meanwhile, reliability of a spacecraft is improved. The interpreting conclusion is transmitted to the interpreting conclusion data base for storing, analyzing can be performed on historic interpreting conclusions of the telemetering data and then a report is formed. Analyzability of the telemetering data is enhanced. A blackboard zone is set up in the executive engine so as to store all the telemetering data which need testing. In a real-time testing process, an internal storage is prevented from continuously loading telemetering data as long as one or more data parameter values are updated according to current telemetering data. Thus, time is saved and efficiency in judging is improved.