The invention discloses an open type multi-stage air film seal non-contact air-supply device for an air floating physical simulation platform. An an air guide unit consisting of air guide block, an air guide hole and a large-area shallow cavity is arranged at the center of a translation platform of the air floating physical simulation platform; an air guide unit consisting of an air guide block and an air guide hole is arranged on a foundation platform; in the process of supplying gas to the air floating physical simulation platform, non-contact air film seal is realized by using an ultra-thinclearance between a multi-stage inverted trapezoidal section narrow zone on the external side of the large-area shallow cavity on the air guide block and an air supply block. According to the open type multi-stage air film seal non-contact air-supply device for the air floating physical simulation platform, continuous external air is provided to the air floating physical simulation platform by using the large-area shallow cavity on the air guide block; and meanwhile, the influence of an additional bearing force is obviously reduced by using multi-stage narrow zone structure; and the open typemulti-stage air film seal non-contact air-supply device for an air floating physical simulation platform has the advantages of long experimental time, small simulation environment interference momentand so on.