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In order to solve the problem of installation and disassembly of the model in and out of the test section ,the design of automatic opening and closing removable section wall in the top face icing tunnel test section was put forward, an automatic opening and closing device of mobile with shape over 12m2,weight of nearly 5t and positioning accuracy of 1mm was developed by the crane hoisting model in and out of the test section. At the top in the center of the icing wind tunnel on the chamber wall design and mobile roof openings with scale,mobile head installed on the lower end of the hoisting mechanism,through the four vertical elevating axis synchronous hosting mechanism,used to open or close the hole on the wall:translational mechanism in promoting mechanism and moving head,along the test section on both sides of the frame at the top of gantry structure support rail with slide horizontally,moving a cover from the wind tuunel wall center moved to the transitiondiffusion section at the top;two-axis servo control system of lifting and translating was developed,which realized the automatic lifting and leveling control of moving top cover under large load,and solved the problems of structural design of moving top cover,mutual difference between leadscrews when lifting with large load and 4-axis synchronously,and high-precision positioning system.The system meets the design target and has been applied to the icing wind tunnel test to improve the efficiency of model replacement.