Automatic three-level weight loading device and loading method for wind tunnel balance calibration

The invention discloses an automatic three-level weight loading device and loading method for wind tunnel balance calibration. A wind tunnel balance is the most important measurement device in a wind tunnel measurement experiment, wind tunnel balance measurement accuracy directly affects accuracy of wind tunnel experiment data, the balance calibration range of an original loading device is limited by a load range and narrowed, and calibration efficiency is low. The loading device comprises a frame (6), a linear sliding rail A (5) is fixed to one side in the frame, a linear sliding rail B (12) is placed on the other side in the frame, a slider (7) is respectively connected with the linear sliding rail A and the linear sliding rail B, and a 1kg weight dragging mechanism, a 5kg weight dragging mechanism and a 30kg weight dragging mechanism are connected with the slider. The automatic three-level weight loading device for wind tunnel balance calibration is applied to wind tunnel balance calibration.