The invention discloses a non-contact gas supply device of a closed gas film sealed gas floatation physical simulation platform. A gas guide unit composed of a gas guide block and a gas guide hole isarranged in the center of a translational motion platform of the gas floatation physical simulation platform, a gas supply unit composed of a gas supply block and a gas supply hole is arranged on a foundation platform, a closed gas floatation unit composed of gas sealing rings, a closed gas film sealing gas supply channel and gas sealing plugs is arranged on the gas supply block, and in the gas supply process of the gas floatation physical simulation platform, gas film sealing is achieved through an ultrathin gas film between the closed gas floatation unit in the fixed gas supply unit and themovable gas guide unit. The gas floatation physical simulation platform ceaselessly supplies gas outwards, the influence of gas pipe disturbance and additional bearing force is eliminated through non-contact gas film sealing between the gas floatation physical simulation platform and an external gas supply channel, and the non-contact gas supply device has the beneficial effects of being long in experiment time, small in simulation environment disturbance moment, reliable in sealing, high in vertical stiffness and the like.