Rigidity-adjustable two-degree-of-freedom vibration test bench

The invention provides a rigidity-adjustable two-degree-of-freedom vibration test bench, which comprises a base (3), a cross-shaped table board (1), a support arm circular ring (5), an elastic support (2) and a bearing seat assembly (4), and is characterized in that the base (3) is of a plate-shaped structure, the support arm circular ring (5) is arranged at the center of the base (3), the cross-shaped table board (1) is arranged on the base (3), and the cross-shaped center is opposite to the center of the base (3) and the center of the support arm circular ring (5); the cross-shaped table board (1) is of a cross-shaped structure, the center of the cross-shaped structure serves as the original point, and the two directions perpendicular to each other are the x direction and the y direction respectively; four branches of the cross-shaped table board (1) are respectively connected with the base (3) through the elastic supports (2); the support arm circular ring (5) is of a circular ring structure, four short su