The invention provides a switchgear spring operating mechanism device fault diagnosis method and device. The fault diagnosis method includes the following steps that: switching-off and switching-on coil current signals and core stroke signals during the switching-off and switching-on operation process of an operating mechanism are detected; analysis processing is performed on the obtained switching-off and switching-on coil current signals and core stroke signals, so that relevant characteristic data are obtained; the obtained characteristic data are compared with a data model library, so thatwhether the operating mechanism is faulty and the fault type of the operating mechanism can be known through diagnosis, wherein the data model library includes a normal state data model and an abnormal state data model which respectively include the characteristic data of the operating mechanism under a normal state and an abnormal state which are corresponding to the switching-off and switching-on coil current signals and the core stroke signals. With the switchgear spring operating mechanism device fault diagnosis method and device of the invention adopted, the problem of low accuracy of adetermined result which is caucused a condition that only switching-off and switching-on coil current signals are adopted to determine the fault type of the operating mechanism of a switchgear in theprior art can be solved.