The invention discloses a big data application oriented power device state quantity dynamic threshold acquiring method. An engineering feasible method is supplied for analyzing a device state quantity through generalized horizontal-and-vertical contrast, so that a calculation result better satisfies an actual requirement, thereby realizing comprehensive analysis from a device group to individuals and accurate determining for the state of the state quantity. Through verification of instances, compared with an existing fixed threshold analysis method, the method provided by the invention has advantages of realizing higher suitability for a fine operation requirement of the power grid, improving availability of field operation data, and reducing risks of excessive equipment maintenance and insufficient equipment maintenance.