The utility model discloses a temporary stable state of alternating current -direct current integration detection device, include experimental power of the temporary stable state of alternating current -direct current integration and electronic type current transformer field test detecting system, wherein the experimental power of the temporary stable state of alternating current -direct current integration a direct current strikes power, a temporary stable state power of direct current, an interchange temporary stable state power of power frequency and synthetic loop control system, electronic type current transformer field test detecting system is including standard mutual inductor, standard conversion equipment, mutual -inductor composite error check gauge. The utility model discloses a detection device can realize the integration of direct current transformer and ac current transformer's temporary stable state experimentally respectively, through the direct current assault / temporarily the experimental power of stable state with exchanges the synthetic test return circuit method that the experimental power of temporary stable state is formed, obvious reduce the direct current and assault / stable state energy -storage capacitor's in experimental capacity temporarily, adjustment that in addition can be accurate nimble more and dispose important parameter such as transient current peak value, attenuation time constant, step current response.