The present invention relates to a radome support structure, and relates to a drawing radome opening mechanism. Upper and lower rails are distributed at one end face of the dual-layer sliding rail (1) of the opening mechanism, two ends of a sliding block (3) are respectively provided with rollers (5) which are located in one rail of the dual-layer sliding rail (1) and can slide in the rail, one ends of ear pieces (2) are respectively provided with the rollers (5), the rollers (5) on the ear pieces (2) are located at the other rail of the dual-layer sliding rail (1), one end of the rail where the rollers (5) on the ear pieces (2) is an opening, the upper end of the sliding block (3) is hinged with the ear pieces (2), and when the radome cover is fixed on the ear pieces (2) and the rollers (5) on the sliding block (3) is moved to one end of the rail, the rollers (5) on the ear pieces (2) slide out of the opening end of the rail. According to the technical scheme, the Drawing radome opening mechanism is light in weight and has little influence on the whole pneumatic layout of the airplane.