Disclosed herein is an apparatus for grinding a compression line spring. The apparatus includes a lower chain conveyor (100), an upper chain conveyor (200), and grinding units (300). The lower chain conveyor includes chain units (110) and (110′) provided facing each other at positions spaced apart from each other. Each chain unit (110), (110′) includes first V-shaped blocks (115) for supporting compression line springs. The upper chain conveyor includes chain units (210) and (210′) provided facing each other at positions spaced apart from each other. Each chain unit (210), (210′) includes second V-shaped blocks (215) for compressing downward upper portions of the compression line springs seated on the first V-shaped blocks (115) and thus supporting the compression line springs. The grinding units (300) grind seat surfaces formed on opposite ends of the compression line springs that are being moved by the lower chain conveyor and the upper chain conveyor.