River-crossing section foundation pit cofferdam construction device and construction method thereof

The invention discloses a river-crossing section foundation pit cofferdam construction device and a construction method thereof, and belongs to the technical field of cofferdam construction. According to the river-crossing-section foundation pit cofferdam construction device and the construction method thereof, a driving assembly is matched with an elastic piece in movement to vibrate a steel plate to conduct downward insertion operation, a connecting column and a piston can be driven by means of vibration force to move up and down, the piston moves downwards, a one-way valve is opened to discharge lower lubricating oil to the position above the piston, and the piston moves upwards; lubricating oil can be discharged through the one-way connector, so that the lubricating oil can drop on the gears for lubricating operation, smooth transmission between the gears is kept, the construction quality of a steel plate is prevented from being affected by blocking, and the lubricating oil can take away heat generated du