An electric vehicle battery pack replacement system. The hardware of said system consists of computers, a first palletizing robot (608), a second palletizing robot (609), a ferry robot (199), a four-post lift (22), a ferry robot track (198), a first conveyance line (607), and a second conveyance line (610). Connection between said hardware and an electric vehicle onboard device is achieved by means of various forms of computer-based supervisory control software, wired/wireless internet, and a 3G/4G wireless network, creating a man-machine dialogue system that utilizes supervisory control center computers to control, command, and guide electric vehicle battery replacement. The system is quick, safe, and prevents drivers unskilled at operating battery replacement systems from causing an accident by replacing a battery incorrectly. The system is well-designed, structurally simple, low in cost, and occupies little space.