The invention discloses a quasi zero stiffness vibration isolation platform adjustable in positive and negative stiffness. The quasi zero stiffness vibration isolation platform adjustable in positive and negative stiffness comprises a movable platform body, a suspension assembly, a shock absorber and an adjusting assembly; the shock absorber is connected with the movable platform body; and the adjusting assembly is connected with the suspension assembly and the shock absorber and is used for adjusting the initial position of the shock absorber. According to the quasi zero stiffness vibration isolation platform adjustable in positive and negative stiffness, the stiffness can be easily and conveniently adjusted, and the quasi zero stiffness vibration isolation platform adjustable in positive and negative stiffness is suitable for broad-frequency domain vibration isolation and has good engineering adaptability; while high bearing stiffness is achieved, low movement stiffness is achieved, the static deformation amount is small, the dynamic inherent frequency is low, and the vibration isolation effect is good; and by means of flexible adjustment of stiffness an damping, and the inherent conflict, namely the conflict of the low-frequency vibration transmissibility and the high-frequency vibration attenuation ratio, restricting a traditional isolation vibration system can be avoided.