The present invention relates to a twin-hulled LNG floater, comprising: an LNG hull body (10) having a first ballast tank (11) where ballast water is held; a floatation body (20) which floats on the surface of the sea to the side adjacent but with a predetermined spacing from the LNG hull body (10), and which is provided with a second ballast tank (21) where ballast water is held; and liquefaction equipment (30) of which one end is supported connected to the LNG hull body (10) and the other end is supported connected to the floatation body (20). Consequently, the floatation body is provided to the side adjacent to the LNG hull body in such a way that the liquefaction equipment is supported connected to these bodies while at the same time the liquefaction equipment can be kept horizontal and can also be supported in a stable fashion by means of a water-level adjusting means on the floatation body, and hence the present invention basically gives advantageous effects such as that it improves the stability of the LNG floater as a whole through the twin-hulled arrangement employing the LNG hull body and the floatation body and, additionally, it allows for easy and rapid installation of liquefaction equipment without remodelling existing LNG vessels.