Grid-connected inverter plays an important role in new energy power generation system. In the development, debugging and building of a grid-connected inverter, the switching devices in the main circuit tend to be damaged due to the improper control algorithm, improper protection circuit design or improper debugging method, thus leading to economic losses and affecting the development progress of inverter. An analog switch and op-amp analog circuit based equivalent model for grid-connected inverter was derived and established, and a semi-object hardware simulation system based on this equivalent model was then designed to emulate the real single-phase grid-connected inverter. The feasibility of the equivalent model was verified through active current disturbing method of islanding detection. The proposal presented can effectively simplify hardware design and reduce debugging cost. The feasibility and effectiveness of the inverter equivalent model were verified with simulation and experiment results.