A continuous compression wire spring polishing apparatus that continuously polishes end surfaces of compression wire springs each seated on a fixed block fixed to a chain conveyor, the apparatus comprising: two grinding units each having a grindstone to which rotational force of a motor is transmitted through a gear box and the two grinding units being installed to be parallel and opposite to each other at opposite sides of a compression wire spring fixed to the continuous compression wire spring polishing apparatus so as to polish opposite end surfaces of the compression wire spring; an upper guide configured to prevent the compression wire spring from springing out; characterised by the motor having a rotary shaft being located above a central axis of the grindstone, and by two hinge shafts, which are fixed at positions, which are spaced apart from grindstone rotation shafts of the grinding units by a predetermined distance, and which are inserted into and coupled to bearings, which are fixed to a body of the polishing apparatus, so as to allow the grinding units to be turned such that the grinding units are switched between a horizontal state and a vertical state; a cylinder rod integrally fixed to a pneumatic cylinder to be interlocked with forward and backward movements of the pneumatic cylinder; and a rod end fixing shaft fixed to an end of the cylinder rod inserted into and coupled to a bearing fixed at a position between the grindstone rotation shaft and the hinge shaft in each of the grinding units, wherein the grindstone rotation shaft of each of the grinding units in use is turned into the vertical state or the horizontal state according to the forward and backward movements of the pneumatic cylinder, so that the two grindstones of the grinding units, which are mounted to be parallel and opposite to each other, can be easily replaced. two grinding units each having a grindstone to which rotational force of a motor is transmitted through a gear box and the two grinding units being installed to be parallel and opposite to each other at opposite sides of a compression wire spring fixed to the continuous compression wire spring polishing apparatus so as to polish opposite end surfaces of the compression wire spring; an upper guide configured to prevent the compression wire spring from springing out; characterised by the motor having a rotary shaft being located above a central axis of the grindstone, and by two hinge shafts, which are fixed at positions, which are spaced apart from grindstone rotation shafts of the grinding units by a predetermined distance, and which are inserted into and coupled to bearings, which are fixed to a body of the polishing apparatus, so as to allow the grinding units to be turned such that the grinding units are switched between a horizontal state and a vertical state; a cylinder rod integrally fixed to a pneumatic cylinder to be interlocked with forward and backward movements of the pneumatic cylinder; and a rod end fixing shaft fixed to an end of the cylinder rod inserted into and coupled to a bearing fixed at a position between the grindstone rotation shaft and the hinge shaft in each of the grinding units, wherein the grindstone rotation shaft of each of the grinding units in use is turned into the vertical state or the horizontal state according to the forward and backward movements of the pneumatic cylinder, so that the two grindstones of the grinding units, which are mounted to be parallel and opposite to each other, can be easily replaced.