Quasi-zero stiffness vibration isolation system suitable for variable mass random load

The invention belongs to the field of dynamic weighing and the field of vibration control, and particularly relates to a quasi-zero stiffness vibration isolation system suitable for variable mass random loads. Comprising a bottom plate, a telescopic dustproof sleeve, a top plate, a plurality of positive stiffness mechanisms and a plurality of multi-stage negative stiffness mechanisms, the bottom plate is connected with the top plate through the telescopic dustproof sleeve; a plurality of multi-stage negative stiffness mechanisms are arranged between the bottom plate and the top plate; a plurality of positive stiffness mechanisms are arranged on the lower surface of the bottom plate. The multi-stage quasi-zero stiffness vibration isolator is composed of a positive stiffness mechanism and a multi-stage negative stiffness mechanism. The mass of the dynamic scale and the mass of the package are mainly supported by the positive stiffness mechanism, and the multi-stage negative stiffness mechanism counteracts the s