The utility model discloses a double-girder transporting and erecting integrated bridge girder erecting machine capable of realizing girder erecting at zero distance from a tunnel portal, which comprises a transporting and erecting machine (1) and a girder guiding machine (2), a transition guiding girder (19) is mounted at the tail end of a lower guiding girder main girder (21), a girder erecting cart stopping ring (18-1) is arranged on a girder erecting cart (18) of the girder guiding machine (2), a temporary pad pier (18-2) is arranged in the girder erecting cart stopping ring (18-1), a lateral cross girder connecting seat (9) in a hemispherical structure is welded to the lower surface of a lateral cross girder (8) close to one side of the girder erecting cart (18), and a jacking oil cylinder (10) is arranged on the lower surface of the lateral cross girder (8) and between two sides of the lateral cross girder connecting seat (9). As the partial composition structure of the integral bridge girder erecting machine is changed, the working condition that a girder can be erected at zero distance from the tunnel portal can be realized without extra equipment, and construction cost is evidently reduced while construction speed is increased.