Secondary loading structure for airplane structural strength ground test

The invention belongs to the field of airplane structural strength ground tests, and particularly relates to a secondary loading structure for airplane structural strength ground test. The secondaryloading structure comprises: a secondary loading lever, wherein each end of the secondary loading lever is connected with one primary loading lever, and the surface of the secondary loading lever is provided with a communicating through hole, limiting bulges are arranged on the inner wall of the connecting through hole, and a first strip-shaped through hole is formed between the limiting bulges and extends along the axial direction of the secondary loading lever; and a knuckle bearing arranged in the connecting through hole, wherein the inner ring of the knuckle bearing is used for being connected with a top-stage loading lever, and the first strip-shaped through hole is used for allowing the top-stage loading lever to pass through. 本申请属于飞机结构强度地面试验领域，具体涉及一种飞机结构强度地面试验次级加载结构，包括：次级加载杠杆，其每端用以对应与一个初级加载杠杆连接，其表面具有连接通孔；连接通