Based on the concept and technology of precision measurement and intelligent measurement, combined with high-precision force loading technology, indentation measurement technology, automatic control technology and robot technology, an unattended intelligent Rockwell hardness testing platform was designed and developed. The platform includes PLC control system, automatic sample injection system, automatic measurement system and automatic marking system, etc. The test results show that the platform has good measurement accuracy and significant advantages in improving measurement efficiency. The completion of the device promotes the intelligent process of hardness measurement, and provides a good reference for the development of unattended precision measurement and calibration of other specialties.