The invention provides a multi-state double-wire electrical arc welding device and welding method to solve the problem that in an existing electrical arc welding method, due to the fact that a fixed proportional relationship exists between the welding wire deposition rate and the weld heat input, contradictions exist between welding wire deposition rate increase and weld heat input reduction, and belongs to the technical field of consumable electrode electrical arc welding. The device comprises a first direct-current pulse power supply, a second direct-current pulse power supply, a welding power supply with the alterable polarity, a first wire sending mechanism, a second wire sending mechanism, a first contact tube, a second contact tube, a first welding wire and a second welding wire. In the welding process, the first direct-current pulse power supply, the first welding wire and a workpiece to be welded form a left electrical arc welding circuit, the second direct-current pulse power supply, the second welding wire and the workpiece to be welded form a right electrical arc welding circuit, and the welding power supply with the alterable polarity, the first welding wire and the second welding wire form a shunt circuit. The multi-state double-wire electrical arc welding device and welding method are used for electrical arc welding.