The invention discloses an automatic download system and method for an automobile EPS (electrical power steering system) controller program. The system comprises an upper computer, a USB-CAN (Universal Serial Bus-Controller Area Network) box, a function board, an EPS controller and a code scanning gun; the upper computer is connected with the USB-CAN box through a USB interface, the USB-CAN box is respectively connected with the function board and the EPS controller through CAN buses, the function board and the EPS controller are mutually connected through a serial port and the CAN buses; the code scanning gun scans a two-dimensional code on the EPS controller to obtain data, and then sends the data to the upper computer through a wire. According to the automatic download system and method for the automobile EPS controller program, a downloading process of the EPS controller program is simplified to a large extent, and the downloading of the controller program can be quickly and reliably completed.