Multi-directional vibration isolator based on quasi-zero stiffness

The invention provides a multi-direction vibration isolator based on quasi-zero stiffness. A vertical structure and a negative stiffness rod are connected to a position between a base and an objective table base of the multi-direction vibration isolator, the side edge of the objective table is connected with the horizontal structure, the negative stiffness of the negative stiffness rod along the rod direction is provided by balls and ball grooves, the negative stiffness of the three negative stiffness along the rod is synthesized into the negative stiffness in the vertical direction, a first buffer piece of the vertical structure forms positive stiffness, and the negative stiffness in the vertical direction synthesized by the negative stiffness rod is connected in parallel with the positive stiffness formed by the first buffer piece of the vertical structure, so that a quasi-zero stiffness system is formed in the vertical direction, a cam and a rolling wheel are connected to generate negative stiffness in the