Emergency bridge and extension structure thereof

The utility model discloses an emergency bridge and a stretching structure thereof, and belongs to the technical field of emergency bridges. The emergency bridge and the extension structure thereof comprise two groups of middle bridge sections and two groups of end bridge sections; the two groups of middle bridge sections comprise a first middle bridge section and a second middle bridge section; the two groups of end bridge sections comprise a first end bridge section and a second end bridge section; the end bridge sections and the middle bridge sections are retracted and stretched through bridge supporting oil cylinders. The bridge supporting oil cylinders symmetrically extend from the middle bridge section to the end bridge sections; the top ends are respectively connected with the end bridge sections through a multi-connecting rod mechanism; the multi-connecting-rod mechanism comprises a first connecting rod, a second connecting rod and a third connecting rod which are connected in pairs. According to the