Movable and detachable steel box girder assembly jig frame

The utility model belongs to the technical field of steel box girder assembly, and particularly relates to a movable and detachable steel box girder assembly jig frame which comprises a jig frame body, a girder conveying channel is arranged in the middle of the jig frame body, a movable jig frame is arranged at the position of the girder conveying channel, and the movable jig frame is detachably connected with the jig frame body. The movable jig frame comprises a jig frame cross supporting beam and a plurality of jig frame supporting columns used for supporting the jig frame cross supporting beam, the bottom ends of the jig frame supporting columns are coaxially connected with supporting screw rods in a threaded mode, telescopic moving assemblies are arranged on the jig frame supporting columns, and each telescopic moving assembly comprises a first connecting rod and a second connecting rod which is coaxially connected with the first connecting rod in a threaded mode. The first connecting rods are fixedly con