In order to intuitively understanding the machining process of deep hole broaching of CNC machine tools, an acquisition system for real-time recording and analysis of parameters such as position and torque of each axis of the machine tool is designed. The composition and function of the system are introduced. The high-speed acquisition of machine data is realized by DSP+FPGA architecture. The data acquisition is realized by embedded industrial computer. The digital subdivision device is designed. The full-closed control function is realized by using the grating with distance coding. And analyze the processing data of the collected CNC deep hole broaching machine. The analysis results show that the device can provide alarm signals when the data is abnormally out of tolerance, and protect the safety of equipment and products.