The invention discloses an automatic spiral bar welding machine for concrete railway sleepers. The automatic spiral bar welding machine comprises a main unit. A spring machine is arranged at an end of the main unit, a vibration motor is arranged at the bottom of the spring machine, an opening is formed in the upper end of an outlet of the spring machine, a copper mandrel, a resistance welding machine, a shearing structure, a collecting device, a reinforcing steel bar straightening device, a retaining device, a feeding device, a pushing device and a control device are arranged on the main unit, the collecting device comprises a traverse cylinder and a fetching cylinder, a magnet is connected onto a cylinder rod of the fetching cylinder, and the reinforcing steel bar straightening device is provided with three outlets which are circumferentially and uniformly formed in positions around the same circle; the feeding device comprises a slide rail, a slide seat is arranged on the slide rail, the bottom of the slide seat is connected with a feeding motor by crank connecting rods, and a first clamping structure is arranged on the slide seat; a second clamping structure is arranged on the retaining device; the pushing device comprises a pushing cylinder, and the pushing cylinder is fixed onto the main unit. The automatic spiral bar welding machine has the advantages that the spiral bar machining efficiency can be improved, the accuracy of bar erecting positions can be guaranteed, and the labor cost can be reduced.