Vehicle CAN bus network is the main application of bus technology, obtained through the CAN bus when the car is running real-time data for automotive electronic systems development, maintenance and fault analysis the principal means. Basis on traditional analysis of CAN-bus test card, in order to make the mobile PC more easily analyze and record vehicle CAN network data, so that based on serial communication systems and application software can easily inherit, designed XMC4500 based microcontroller automotive CAN network testing card, realized the vehicle CAN network data and transmit it to upper PC through the USB port high-speed virtual serial transmission, real-time backup-related data to the Micro SD card function, experimental data show that at the highest 1000kb / s transfer rate, can be 100% correct receiving and storing data, the card meets the requirements of real-time and reliability.