Abstract: Troubleshooting of a three-phase asynchronous motor’s control circuit is a critical knowledge point for experimental teaching. However, object teaching faces with challenges of high cost of fault design and detection, high risk of high voltage at live working, and hard verification of circuit analysis. Besides, commercial electrical design simulation software is not suitable for students to learn as elementary course. Therefore, a virtual simulation experiment of the fault diagnosis of the ship motor’s control circuit is designed. It could simulate real piping system working scenario, control cabinet and electrical parts in a three-dimensional virtual reality model. By restoring running status and troubleshooting process of the circuit under faults, students could experience random simulation of faults, and measure voltage and resistance of any node. The virtual simulation experiment designed in this paper has been successfully applied to undergraduate experimental teaching, which received excellent teaching outcomes.