The invention discloses an impedance simulation scanning method for an AC/DC hybrid system and device. The method comprises steps: an RTDS real-time simulator acquires electrical data for simulation according to harmonic current of a preset frequency injected to a tested system, and the data are transmitted to DC control equipment through a DC control equipment special interface device; the DC control equipment simulates DC control characteristics according to the received electrical data, control pulse signals are generated, and the control pulse signals are returned to the RTDS real-time simulator through the DC control equipment special interface device; and according to the received control pulse signals, being inputted to a preset simulation model to calculate the voltage and currentresponses of the tested system is carried out by the RTDS real-time simulator, and the impedance of the tested system is obtained. The problem that impedance calculation in the prior art ignores the influences of the DC control characteristics, and thus, the relationship between impedance and frequency of the AC/DC hybrid system can not be truly reflected can be effectively solved, and a method ofeffectively calculating the impedance of the AC/DC hybrid complex system can be provided.