The invention relates to the ocean engineering equipment technology and discloses a floating shipyard and a floating type ship maintenance and construction method. According to the floating shipyard and an operation mode, multiple ships can be integrally maintained or constructed on the sea. The floating shipyard adopts a flat floating body structure, a harbor basin is formed through an open typebreach, multi-lifting-point united lifting devices are arranged on the two sides of the harbor basin, the lifting devices are provided with bag bottom type lifting tools, operation that is the ships are integrally and quickly lifted out of water to an upper deck or descend into water can be achieved, and the destructive load applied to hulls in the integrally-lifting process can be eliminated through distributed united lifting. Movement tracks and lifting equipment are laid on the deck, and the upper deck can achieve the function similar to a land shipway. The floating shipyard can be locatedin an outer sea area, and integral out-of-water maintenance or construction of the multiple ships is achieved.