Portal frame type synchronous lifting device

The utility model discloses a portal frame type synchronous lifting device, which relates to the technical field of portal frames, and is characterized by comprising a portal frame main frame, the upper end of the portal frame main frame is rotatably connected with a linkage shaft, one end of the linkage shaft is fixedly connected with a first-stage driven wheel, and an output shaft of a gearbox is connected with the first-stage driven wheel through a first-stage transmission belt. Secondary driving synchronous wheels are mounted at the two ends of the linkage shaft, secondary driven synchronous wheels are rotationally connected to the upper end faces of the two mounting bottom plates, the secondary driving synchronous wheel and the secondary driven synchronous wheel located on the same side are connected through a lifting synchronous belt, and a belt clamping frame is fixedly connected to the lifting synchronous belt; the combined type lifting device has the advantages that the two lifting synchronous belts