The invention discloses a large disc blocking spring welding and punching-denting all-in-one machine. The large disc blocking spring welding and punching-denting all-in-one machine comprises a rack, awire feeding device, a winding device, a welding device, a pressing-denting device and a transverse conveying device, wherein the welding device comprises a welding frame fixedly arranged on the rack, a cutting mechanism which is arranged on the lower part of the welding frame for separating the wound large disc blocking spring form a wire, a butt-welding mechanism which is arranged above the cutting mechanism for welding a cut-off part of the large disc blocking spring, and a longitudinal conveying mechanism which is used for lifting the cut large disc blocking spring into the butt-welding mechanism to weld. With the adoption of the technical scheme, the wire is wound after being fed, is clamped and upwards moved into the welding device to subject to butt-welding, so that a sealed coil is formed; and finally, the transverse conveying device is used for feeding a large disc blocking spring semi-finished product into a pressing-denting device to subject to pressing-denting, so that thefinished product of the large disc blocking spring is obtained. The whole large disc blocking spring welding and punching-denting all-in-one machine is compact in structure, is stable and reliable inproduction process, is high in production efficiency, can accomplish all processes of the large disc blocking spring without a special production worker, and saves labor power.