The invention discloses a gravity meter based on a nonlinear superconductive magnetic spring. The gravity meter comprises a superconductive magnetic spring oscillator and a displacement detecting unit. The superconductive magnetic spring oscillator comprises current-carrying coils and a testing mass body. The current-carrying coils and the testing mass body are each made of a superconductive body.The testing mass body is a cylinder with a middle partition plate. The current-carrying coils are arranged at the corresponding positions of the two ends of the middle partition plate respectively. The magnetic repulsion force between the current-carrying coils and the testing mass body balances the gravity of the testing mass body, and magnetic levitation is conducted on the testing mass body. The resultant force of the magnetic force borne by the testing mass body and the gravity of the testing mass body has the properties of resilience, the vertical superconductive magnetic spring oscillator is formed by the current-carrying coils and the testing mass body, and the magnetic repulsion force between the current-carrying coils and the testing mass body is in nonlinear relation with the distance between the current-carrying coils and the testing mass body; the displacement detecting unit is used for detecting the displacement of the testing mass body so as to detect the time-varying gravity acceleration of the gravity meter in the environment. The gravity meter can still normally work under the condition of large-amplitude platform vertical vibration.