An isolated superconducting magnetic energy storage system quench detection device disclosed by the present invention comprises a signal acquisition part and a signal processing part separated from and electrically connected with the signal acquisition part, and is characterized in that the signal acquisition part comprises a Hall element, and the signal processing part comprises a compensating circuit, a signal amplifying circuit and a voltage measurement device which are connected orderly; the Hall element is electrically connected with the compensating circuit, and the signal amplifying circuit is also connected with a no-voltage zero setting circuit. The isolated superconducting magnetic energy storage system quench detection device also comprises a DC power supply module for supplying power to the modules. The isolated superconducting magnetic energy storage system quench detection device of the present invention can realize the rapid, convenient and accurate quench detection, can detect the quench indexes directly, can determine the quenching by detecting the magnetic induction intensity of an energy storage device directly, can accurately detect the quenching on the condition of not having other strong-magnetic field objects, and is not interfered easily. Meanwhile, when a magnetic energy storage system quenches, the magnetic field fluctuation is large, the criterions are obvious, and the anti-interference performance is also enhanced.