Flat pressing machine with floating table top

The utility model discloses a flat pressing machine with a floating table top, which comprises a machine frame, a fixing plate arranged on the machine frame, a lifting driving assembly arranged on the fixing plate, a pressing plate connected below the lifting driving assembly, a working table arranged below the pressing plate, a workpiece to be pressed and formed placed on the working table, and a buoyancy plate arranged on the working table. The buoyancy plate is suspended on liquid in the water tank, the water tank is located below the flattening plate and extends outwards, the flattening plate is pushed by the lifting driving assembly to press the upper surface of the to-be-pressed forming workpiece downwards, and the upper surface of the buoyancy plate is kept parallel to the lower surface of the flattening plate. The buoyancy plate of the device is supported by buoyancy of liquid in the water tank, stress distribution is uniform, comprehensive contact of the upper and lower plate surfaces of the buoyancy