The invention relates to a floating
liquefied natural gas (FLNG) production, storage and unloading device adaptive to adverse sea conditions, comprising a boat body, FLNG upper equipment arranged on a boat body
deck, a cargo hold arranged in the boat body, an inner
turret single-point cabin arranged at the inner head part of the boat body, an inner
turret single-
point system arranged in the single-point cabin, and a propelling
system arranged at the
tail part of the boat body, wherein the FLNG upper equipment and the cargo hold are used for realizing basic functions of production, storage and unloading of the production, storage and unloading device; the inner
turret single-
point system has a single-point positioning function and can perform single-point disengagement and tie-back under adverse sea conditions; the propelling
system comprises multiple pieces of full circle swinging propelling equipment and is used for providing self-propulsion power of the production, storage and unloading device, and can adjust an included angle between the boat body and a wave direction or
wind direction during transmission operation. According to the floating
liquefied natural gas production, storage and unloading device, quick disengagement and tie-back can be realized, under the adverse sea conditions, such as
typhoon, self-propulsion by the propelling
system of the device can be performed to get away from a sea area where the
typhoon passes, and safety of all systems of the device and workers is effectively protected.