The invention discloses a hole wall opening-closing ratio continuously adjustable device applied to a transonic wind tunnel test section. The hole wall opening-closing ratio continuously adjustable device comprises a frame, a fixed plate, a movable plate assembly, a driving mechanism and a pressing mechanism. The frame is fixedly connected with the surface of the fixed plate, the movable plate assembly is slidably installed on the surface of the fixed plate, inclined holes which are evenly arranged in an aligned mode are formed in the movable plate assembly and the surface of the fixed plate, and the movable plate assembly adjusts the opening-closing ratio of the inclined holes through dislocation displacement with the fixed plate; the driving mechanism is used for driving the movable plate assembly to translate; the pressing mechanism enables the movable plate assembly to be tightly attached to the fixed plate. The synchronous spiral elevator drives the swing rod to reciprocate so that the inclined holes which are originally aligned with the fixed plate and the movable plate assembly are staggered, the ventilation rate of the wall plate is adjusted, the opening-closing ratio of the hole wall is continuously adjustable, other hole walls do not need to be replaced, the device is economical and practical, and the test cost is reduced. The mechanical and electrical integration design is adopted, the structure is compact, operation is easy and convenient, the problem of wallboard hoisting and replacing is solved, and the test efficiency is improved.